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dryopetalon

Habit Annuals or biennials; not scapose; usually pubescent or hirsute, rarely glabrous.
Stems

erect or ascending, unbranched or branched basally or distally.

Leaves

basal and cauline;

petiolate or sessile;

basal rosulate or not, petiolate, blade margins entire, dentate to runcinate, or pinnatifid;

cauline petiolate or [sub]sessile, blade (base not auriculate, or auriculate to amplexicaul), margins entire or dentate to pinnatifid.

Racemes

(corymbose, initially congested), considerably elongated in fruit.

Flowers

sepals erect to ascending, oblong [ovate], lateral pair slightly saccate or not basally, (glabrous or pubescent);

petals white or purplish, spatulate or obovate (longer than sepals), claw gradually narrowed from blade to base, (margins sometimes pinnatifid, or deeply 2-lobed);

stamens tetradynamous;

filaments not dilated basally, (glabrous or papillate basally);

anthers oblong;

nectar glands: lateral annular, median glands confluent with lateral.

Fruiting pedicels

ascending, divaricate, or horizontal, slender.

Fruits

sessile or shortly stipitate, usually linear, rarely linear-oblong, torulose or smooth, terete or flattened (latiseptate);

valves each with a distinct midvein, glabrous;

replum rounded;

septum complete, not veined;

ovules 10–110 per ovary;

style distinct;

stigma capitate, usually entire, rarely slightly 2-lobed.

Seeds

uniseriate, plump, usually not winged, rarely narrowly so, ovate [oblong];

seed coat not mucilaginous when wetted;

cotyledons accumbent [incumbent].

x

= [10] 12, 14.

Dryopetalon

Distribution
from USDA
sw United States; n Mexico
[BONAP county map]
Discussion

Species 8 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Cauline leaves shortly petiolate or sessile, blade bases not auriculate; fruits 0.5-1.2 mm wide; ovules 60-110 per ovary; seeds not winged; petal margins pinnatifid.
D. runcinatum
1. Cauline leaves sessile, blade bases auriculate; fruits 2-3 mm wide; ovules 10-28 per ovary; seeds winged (narrowly); petal margins usually entire, sometimes repand.
D. viereckii
Source FNA vol. 7, p. 688. Author: Ihsan A. Al-Shehbaz.
Parent taxa Brassicaceae > tribe Thelypodieae
Subordinate taxa
D. runcinatum, D. viereckii
Synonyms Rollinsia
Name authority A. Gray: Smithsonian Contr. Knowl. 5(6): 11, plate 11. (1853)
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