Difference between revisions of "Physaria gracilis"
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Revision as of 22:30, 5 November 2020
Annuals or biennials; (delicate, wiry); with a fine taproot; pubescent, trichomes (sessile or subsessile), 4–7-rayed, rays distinct, usually furcate, occasionally bifurcate, (smooth to somewhat tuberculate). Stems simple to several from base, erect, often outer decumbent, (unbranched or branched distally), 1–7 dm. Basal leaves: blade oblanceolate to elliptic, 1.5–8(–11.5) cm, margins lyrate-pinnatifid to dentate or repand, (abaxial surface densely pubescent, adaxial sparsely pubescent). Cauline leaves: (proximal petiolate, distal sessile); blade oblanceolate to oblong, 1–7 cm, margins dentate to repand. Racemes loose, (elongated). Fruiting pedicels (usually divaricate-spreading, sometimes horizontal or shallowly recurved, straight or slightly curved), (7–)10–20(–25) mm, (slender or stout). Flowers: sepals elliptic or broadly ovate, 3–6.5(–8) mm, (median pair slightly thickened apically, cucullate); petals (yellow to orange), broadly obovate, 6–11 mm, (narrowing gradually to short claw). Fruits (stipitate or subsessile, gynophore 1–2 mm), globose, subglobose, obpyriform, or obovoid, not or slightly inflated, 3–9 mm; valves (not retaining seeds after dehiscence), glabrous throughout or sparsely pubescent inside; replum as wide as or wider than fruit; ovules 8–20(–28) per ovary; style 2–4.5 mm. Seeds slightly flattened.
Distribution
Ala., Ill., Iowa, Kans., La., Miss., Mo., Okla., Tenn., Tex.
Discussion
Subspecies 2 (2 in the flora).
Selected References
None.
Key
| 1 | Stems to 7 dm; cauline leaves: blade margins usually deeply dentate, rarely repand; fruits ± sessile, globose or subglobose, 3-6 mm, bases rounded. | Physaria gracilis subsp. gracilis |
| 1 | Stems usually less than 3 dm; cauline leaves: blade margins frequently repand, occasionally dentate; fruits stipitate (gynophore slender), obpyriform to narrowly obovoid, (5-)6-9 mm, bases truncate. | Physaria gracilis subsp. nuttallii |