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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

PAPAVER

Gary L. Hannan


Annual [perennial herb]; sap white, orange, or red. Leaf: basal and cauline [or basal], deeply pinnate-lobed, glabrous or hairy, glaucous or not. Inflorescence: axillary or terminal, 1-flowered. Flower: bud nodding; sepals 2, shed at flower; petals generally 4, free, obovate to wedge-shaped, white to red or purple; stamens many, free; placentas 4–20, style 0(1), stigma disk- or head-like, lobes 4–20. Fruit: dehiscent by pores below stigma. Seed: many, < 0.7 mm, reniform, net-ridged, brown or black.
70+ species: especially Eurasia. (Latin: poppy) Papaver dubium L. (fruit ± oblong, glabrous; peduncle hairs near flower appressed, stiff), perhaps in California as waif.

Key to Papaver

1. Style present; stigma head-like, lobes 4–11 ..... P. heterophyllum

1' Style 0; stigma disk-like, lobes 4–20

2. Cauline leaf base clasping; fruit 3–5 cm, round ..... [P. somniferum]

2' Cauline leaf base not clasping; fruit 1–2 cm, narrowly obovate to round

3. Peduncle hairs appressed; leaf segments linear to lanceolate; fruit bristly

4. Fruit oblong to club-shaped, hairs sparse, soft ..... [P. argemone]

4' Fruit obovate to round, hairs dense, stiff ..... P. hybridum

3' Peduncle hairs 0 or spreading; leaf segments oblong to lanceolate; fruit glabrous

5. Petals 10–20 mm; peduncle glabrous or soft-hairy; fruit narrowly obovate; native, after fire or disturbance ..... P. californicum

5' Petals 20–40 mm; peduncle bristly; fruit widely obovate to round; alien, from cultivation ..... P. rhoeas

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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