Cucurbita pepo (seed)

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=Introduction=
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{{DISPLAYTITLE:''Cucurbita pepo'' (seed) }} {{askbox|herb=''Cucurbita pepo''}}
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=Macroscopic Entries=
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=Nomenclature=
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{{Macroscopy | source=United States Dispensatory (1918)
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{{nomenclature | binomial=Cucurbita pepo
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| description=''Cucurbita Pepo'', or common pumpkin, is a plant almost too well
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|authority=L.
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known to need description.
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|family=Cucurbitaceae
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The seeds are broadly elliptical or ovate, from 15 to 23
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|scn=pumpkin
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mm. in length and from 2 to 3 mm. in thickness; externally yellowish-white,
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|syn=
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very smooth, occasionally with thin, transparent fragments of
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|ayurvedic=
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adhering pulp and with a shallow groove parallel to and within 1 mm.
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|pinyin=
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of the margin; fracture short, seed-coat consisting of a white coriaceous
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|aka=
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outer layer and a membranous inner layer occasionally of a dark green
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|notes= }}
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color; embryo whitish, straight, with a small conical hypocotyl and two
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plano-convex cotyledons; slightly odorous when contused; taste bland
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and oily. Under the microscope, sections of Pepo show an outer
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epidermal layer consisting of palisade-like cells, the radial walls
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attaining a length of 1 mm., the outer walls being usually torn off so
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that it appears as though the seeds were covered with very long hairs; a
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sub-epidermal layer consisting- of from 5 to 12 rows of cells with slightly
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thickened, lignified and porous walls; a layer of strongly lignified stone
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cells, elliptical in outline and about 0.075 mm. in length; a single layer
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of small cells resembling those of the sub-epidermal layer; several rows
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of parenchyma cells with characteristic reticulate markings and
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separated from each other by large intercellular spaces; several layers of
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parenchyma cells, the inner layer being more or less collapsed and
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bounded on the inside by a single epidermal layer, the cells having
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rather thick walls; the perisperm cells are usually more or less collapsed
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and the endosperm consists of a single layer of cells filled with small
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aleurone grains; the cotyledons consist of thin-walled, isodiametric,
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elongated or palisade-like cells containing a fixed oil and numerous
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small aleurone grains.}}
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=Botanical Voucher Specimen=
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{{Media      |cat=Voucher
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            | source=MOBOT, Tropicos.org
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            | mainimage=Cucurbita_pepo_subsp._texana_Tropicos_100135770.jpg
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            | companyimage=TropicosLogo.gif
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            | companyURL=http://www.tropicos.org/Image/100135770
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            | reference=Tropicos.org. Missouri Botanical Garden. 25 Mar 2014 <http://www.tropicos.org/Image/100135770>
  
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=Microscopic Entries=
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            | }}
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=HPTLC Entries=
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=Organoleptic Characteristics=
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{| border=1
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|
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{{Organolepsy | source=United States Dispensatory (1918)
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| description=[''Cucurbita Pepo'' is] slightly odorous when contused; taste bland
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and oily. }}
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|}
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=Macroscopic Characteristics=
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{| border=1
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|
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{{Macroscopy | source=United States Dispensatory (1918)
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| description=''Cucurbita Pepo'', or common pumpkin, is a plant almost too well known to need description.  The seeds are broadly elliptical or ovate, from 15 to 23 mm. in length and from 2 to 3 mm. in thickness; externally yellowish-white, very smooth, occasionally with thin, transparent fragments of adhering pulp and with a shallow groove parallel to and within 1 mm. of the margin; fracture short, seed-coat consisting of a white coriaceous outer layer and a membranous inner layer occasionally of a dark green color; embryo whitish, straight, with a small conical hypocotyl and two plano-convex cotyledons.}}
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|}
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=Microscopic Characteristics=
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{| border=1
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|
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{{Macroscopy | source=United States Dispensatory (1918)
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| description=Under the microscope, sections of [''Cucurbita Pepo''] show an outer epidermal layer consisting of palisade-like cells, the radial walls attaining a length of 1 mm., the outer walls being usually torn off so that it appears as though the seeds were covered with very long hairs; a sub-epidermal layer consisting- of from 5 to 12 rows of cells with slightly thickened, lignified and porous walls; a layer of strongly lignified stone cells, elliptical in outline and about 0.075 mm. in length; a single layer of small cells resembling those of the sub-epidermal layer; several rows of parenchyma cells with characteristic reticulate markings and separated from each other by large intercellular spaces; several layers of parenchyma cells, the inner layer being more or less collapsed and bounded on the inside by a single epidermal layer, the cells having rather thick walls; the perisperm cells are usually more or less collapsed and the endosperm consists of a single layer of cells filled with small aleurone grains; the cotyledons consist of thin-walled, isodiametric, elongated or palisade-like cells containing a fixed oil and numerous small aleurone grains.}}
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|}
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=High Performance Thin Layer Chromatographic Identification=
 
{{HPTLC | source=Elan M. Sudberg, Alkemist Laboratories
 
{{HPTLC | source=Elan M. Sudberg, Alkemist Laboratories
 
             | description=Pumpkin (seed) (''Cucurbita pepo'')
 
             | description=Pumpkin (seed) (''Cucurbita pepo'')
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             | }}
 
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=Other Points of Interest=
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=Supplementary Information=
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[[Category:NoIntro]]
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=Sources=
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<references />

Latest revision as of 19:29, 2 June 2014

AHPA recognizes other valuable resources exist regarding the identity of Cucurbita pepo.

To submit a suggestion or contribution, please contact Merle Zimmermann.

Contents

Nomenclature

Cucurbita pepo L.   Cucurbitaceae  
Standardized common name (English): pumpkin

Botanical Voucher Specimen

bottomright

Cucurbita pepo subsp. texana Tropicos 100135770.jpg
Source: MOBOT, Tropicos.org[1]

Organoleptic Characteristics

[Cucurbita Pepo is] slightly odorous when contused; taste bland

and oily.
Source: United States Dispensatory (1918) [2]

Macroscopic Characteristics

Cucurbita Pepo, or common pumpkin, is a plant almost too well known to need description. The seeds are broadly elliptical or ovate, from 15 to 23 mm. in length and from 2 to 3 mm. in thickness; externally yellowish-white, very smooth, occasionally with thin, transparent fragments of adhering pulp and with a shallow groove parallel to and within 1 mm. of the margin; fracture short, seed-coat consisting of a white coriaceous outer layer and a membranous inner layer occasionally of a dark green color; embryo whitish, straight, with a small conical hypocotyl and two plano-convex cotyledons.

Source: United States Dispensatory (1918) [3]

Microscopic Characteristics

Under the microscope, sections of [Cucurbita Pepo] show an outer epidermal layer consisting of palisade-like cells, the radial walls attaining a length of 1 mm., the outer walls being usually torn off so that it appears as though the seeds were covered with very long hairs; a sub-epidermal layer consisting- of from 5 to 12 rows of cells with slightly thickened, lignified and porous walls; a layer of strongly lignified stone cells, elliptical in outline and about 0.075 mm. in length; a single layer of small cells resembling those of the sub-epidermal layer; several rows of parenchyma cells with characteristic reticulate markings and separated from each other by large intercellular spaces; several layers of parenchyma cells, the inner layer being more or less collapsed and bounded on the inside by a single epidermal layer, the cells having rather thick walls; the perisperm cells are usually more or less collapsed and the endosperm consists of a single layer of cells filled with small aleurone grains; the cotyledons consist of thin-walled, isodiametric, elongated or palisade-like cells containing a fixed oil and numerous small aleurone grains.

Source: United States Dispensatory (1918) [4]

High Performance Thin Layer Chromatographic Identification

AP-LOGO-Laboratories Crop - Copy.jpg
(thumbnail)
Cucurbita pepo HPTLC ID - Vanillin Sulfuric Acid Reagent Visible Light

Pumpkin (seed) (Cucurbita pepo)

Lane Assignments Lanes, from left to right (Track, Volume, Sample):

  1. 3 μL Cucurbita pepo-1 (seed)
  2. 3 μL Cucurbita pepo-2 (seed no shells)
  3. 3 μL Cucurbita pepo-3 (seed no shells)
  4. 3 μL Cucurbita pepo-4 (seed)
  5. 3 μL Cucurbita pepo-4 (seed)
  6. 3 μL Cucurbita pepo-5 (seed no shells)
  7. 3 μL Cucurbita pepo-6 (seed with shells)
  8. 2 μL Cucurbita pepo-7 (seed)

Reference materials used here have been authenticated by macroscopic, microscopic &/or TLC studies according to the reference source cited below held at Alkemists Laboratories, Costa Mesa, CA. 

Stationary Phase Silica gel 60, F254, 10 x 10 cm HPTLC plates 

Mobile Phase chloroform: ethanol [9.5/0.5] 

Sample Preparation Method 0.3 g + 3 ml CH3OH sonicated + heated @ 50° C ~ 1 hr. 

Detection Method Vanillin/H2SO4 Reagent -> 110° C 5 min -> visible light 

Reference see British Herbal Pharmacopoeia, 1996


Source: Elan M. Sudberg, Alkemist Laboratories [5]

Supplementary Information

Sources

  1. ↑ MOBOT, Tropicos.org http://www.tropicos.org/Image/100135770
  2. ↑ United States Dispensatory (1918)
  3. ↑ United States Dispensatory (1918)
  4. ↑ United States Dispensatory (1918)
  5. ↑ Elan M. Sudberg, Alkemist Laboratories http://www.alkemist.com
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