>() CRUCIFERAE (MUSTARD FAMILY) 



late: petals broadly spatulate, 8-12 mm. long: siliques in a short raceme, 

 subglobose or oval, substipitate, glabrous, 6-8 mm. long, on ascending ped- 

 icels of about the same length; style a little shorter than the silique. [L. 

 pruinosa Greene, Pitt. 4: 307. 1901 (?); L. ovata Greene, 1. c.; L. ovalifolia 

 Rydb in Brit. 111. Fl. 2: 137. 1897.) Southern Colorado to Texas. 



11. Lesquerella aurea Wooton, Bull. Torr. Bot. Club 25: 260. 1898. An- 

 nual, branching from the base, 2-3 dm. high, leafy up to the short racemes of 

 bright yellow flowers: leaves pale green, thin, rather thinly covered with the 

 fine branched pubescence, oblong to broadly oblanceolate-cuneate, 1-3 cm. 

 long: siliques glabrous, subglobose, somewhat longer than the slender style 

 but much exceeded by the finally recurved pedicel. New Mexico and prob- 

 ably extending into southern Colorado. 



16. HUTCHINSIA R. Br. 



Low spreading annual, only a few cm. high, with entire or pinnately lobed 

 leaves and minute white flowers in crowded racemes which become greatly 

 elongated in fruit. Stigma sessile or nearly so. Silique oval, compressed at 

 right angles to the septum; each valve with a conspicuous mid-nerve. Cap- 

 sdla in part. 



1. Hutchinsia procumbens (L.) Desv. Journ. Bot. 3: 168. 1814. Glabrous 

 or pubescent with forked hairs, very slender and diffusely branched: radical 

 leaves pinnate or pinnatifid with few lobes; the upper oblanceolate to linear, 

 entire: siliques elliptic-oblong, on very slender spreading pedicels. Capsella 

 divaricata. Colorado, Wyoming, and westward. 



17. CAPSELLA Medik. SHEPHERD'S PURSE 



An annual herb but often enduring a second year, the leaves mostly rosulate 

 and the minute white flowers in elongated racemes. Silique obcordate or 

 triangular-cuneate, flattened at right angles to the septum; style short but 

 evident. Seeds numerous. (Bursa Weber.) 



1. Capsella bursa-pastoris Medik. Pflanzengat. 1: 85. 1792. More or less 

 hirsute with branched hairs: radical leaves mostly runcinate-pinnatifid ; cau- 

 line lanceolate and auricled at the base: flowers white in a congested raceme, 

 which becomes greatly elongated in fruit: siliques cuneate-obcordate, 6-8 

 mm. long. Naturalized from Europe, but now one of the commonest weeds 

 everywhere. 



18. CAMELINA Crantz. FALSE FLAX 



Erect annuals with sagittate-clasping mostly entire leaves and yellow or 

 white flowers. Sepals short-oblong. Petals unguiculate. Silique obovoid, 

 with u broad, thin, persistent septum; the valves firm and strongly convex. 

 Seeds numerous, wingless. 



1. Camelina sativa Crantz, Stirp. Austr. 1: 18. 1762. Pubescent or some- 

 times nearly ^lubrous annual, simple or branched, 3-6 dm. high: lower leaves 

 lanceolate, entire or toothed; cauline sessile, sagittate-clasping: flowers 

 numerous, yellowish: silique pear-shaped, 6-9 mm. long, on slender ascending 

 pedicels 1-2 cm. long; style slender, short. Naturalized from Europe; com- 

 mon, especially where flax has been grown; not infrequent in our range. 



19. DRABA Dill 



Annual, biennial, or perennial herbs, mostly low, the leaves entire or toothed 



and the white or yellow flowers in crowded racemes which become more or 



united in fruit. Sepals short, broad, and obtuse. Petals obovate or 



spatulate, entire or somewhat notched at apex. Style mostly short, or want- 



