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FNA | Family List | FNA Vol. 7 | Brassicaceae

77. Paysonia O’Kane & Al-Shehbaz, Novon. 12: 380. 2002.

[For Edwin Blake Payson, 1893-1927, American botanist and first monographer of Lesquerella]

Steve L. O’Kane Jr.

Annuals or, rarely, biennials or perennials; not scapose; pubescent or glabrous, trichomes short-stalked, forked or subdendritic, often mixed with coarse, simple ones. Stems erect, ascending, decumbent, or procumbent, unbranched or branched. Leaves basal and cauline; petiolate or sessile; basal rosulate, petiolate, blade margins entire, dentate, or pinnately lobed; cauline sessile, blade (base usually auriculate or sagittate, sometimes amplexicaul), margins dentate to lobed. Racemes (several-flowered), often strongly elongated in fruit, (rachis straight). Fruiting pedicels ascending to divaricate or recurved, (straight or slightly curved), slender. Flowers: sepals (deciduous), suberect, ascending, or spreading, oblong, (equal), lateral pair not saccate basally, (margins membranous); petals yellow or white, broadly obovate, claw slightly differentiated from blade, (apex rounded, truncate, retuse, or emarginate); stamens (erect), tetradynamous; filaments dilated or not basally; anthers oblong or sagittate, (not apiculate); nectar glands confluent, subtending bases of median stamens, surrounding lateral stamens. Fruits silicles, subsessile or sessile, globose, subglobose, subpyriform, suborbicular, orbicular, elliptic, cordate, or obovoid, terete, flattened, latiseptate, or angustiseptate; valves (papery or leathery), not veined, glabrous or pubescent, (trichomes branched and/or simple); replum not flattened; septum complete, perforated, or reduced to a rim, (membranous); ovules 4-40 per ovary; style distinct, (persistent, slender); stigma capitate, entire. Seeds sub-biseriate, flattened, margined, orbicular, suborbicular, or oval; cotyledons accumbent. x = 7, 8, 9.

Species 8 (8 in the flora): sc, se United States, n Mexico.

SELECTED REFERENCES Rollins, R. C. 1955. The auriculate-leaved species of Lesquerella (Cruciferae). Rhodora 57: 241-264. Rollins, R. C. and E. A. Shaw. 1973. The Genus Lesquerella (Cruciferae) in North America. Cambridge, Mass.

1 Fruits orbicular, elliptic, or cordate   (2)
+ Fruits globose, subglobose, subpyriform, or obovoid   (3)
2 (1) Fruits angustiseptate; fruiting pedicels recurved; cauline leaf blades: base cuneate to auriculate, not amplexicaul; filaments not dilated basally.   4 Paysonia lasiocarpa
+ Fruits latiseptate; fruiting pedicels divaricate or nearly straight; cauline leaf blades: base auriculate to sagittate, sometimes amplexicaul; filaments dilated basally.   5 Paysonia lescurii
3 (1) Petals white or pale lavender; septums perforate or nearly absent   (4)
+ Petals yellow; septums complete   (5)
4 (3) Fruits subpyriform, valves sparsely hirsute or glabrate; styles glabrous.   7 Paysonia perforata
+ Fruits subglobose, valves densely hirsute; styles hirsute, at least proximally.   8 Paysonia stonensis
5 (3) Fruit valves pubescent; styles glabrous or pubescent proximally.   2 Paysonia densipila
+ Fruit valves and styles glabrous   (6)
6 (5) Fruits 3-4 mm; ovules 4-8 per ovary; septums opaque.   6 Paysonia lyrata
+ Fruits 4-6(-8) mm; ovules (8-)12-28(-40) per ovary; septums translucent   (7)
7 (6) Stems hirsute proximally, trichomes simple; petals 4-5 mm wide.   1 Paysonia auriculata
+ Stems pubescent proximally, trichomes branched; petals 6-9 mm wide.   3 Paysonia grandiflora

Lower Taxa


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