44 CRUCIFER^. Tropidocarpum. 



20. TROPIDOCARPUM, Hook. 

 Pod linear, flattened laterally, often 1-celled by the disappearance of the narrow 

 partition : valves carinate, 1-nerved. Seeds in two rows, minute, flattened, not 

 winged : cotyledons incumbent. Style short. — A low slender hirsute branching 

 annual, with pinnately divided leaves, and yellow solitary axillary flowers. 



1. T. gracile, Hook. Stems weak, 2 feet high or less : leaves pinnatifid or 

 rarely 2-pinnatitid, with narrow or linear segments : flowers in the axils of the upper 

 bract-like leaves; petals 1-| to 3 lines long, nearly twice longer than the obtuse 

 sepals : pods 6 to 20 lines long, more than a line broad, pointed at both ends, 

 ascending on slender spreading pedicels 10 to 20 lines long. — Ic. PI. t. 43. T. sea- 

 hrmscidum, Hook. 1. c. t. 52. 



Valleys and low hills in the Coast Eanges from Los Angeles to the Sacramento. 



21. CAPSELLA, Mcench. 



Pod obcordate or oblong, much flattened laterally, many-seeded : valves carinate, 

 1-nerved. Seeds not winged : cotyledons incumbent. Style none or very short. — 

 Slender and mostly smooth annuals ; with small white flowers, and simple or pin- 

 nate leaves. 



Only half a dozen species are known, somewhat diverse in habit and characters, natives of the 

 northern hemisphere, — two North American, of which one enters California. 



1. C. divaricata, Walp. Glabrous, very slender and diffusely branched, 3 to 

 1 2 inches high : radical leaves an inch long or less, pinnate or pinnatifid with few 

 lobes, the upper oblanceolate to linear, entire : pods elliptic-oblong, 2 lines long, on 

 very slender spreading pedicels. — Watson, Bot. King Exp. 28. Hymenolohus diva- 

 ricatus & erectus, Kutt. in Torr. & Gray, Fl. i. 117. 



In saline or alkaline soils ; Vallejo {Greene) ; S. California (Coidtcr) ; and eastward of the 

 Sierra Nevada from the Columbia River to Colorado and S. Utah. 



2. C. Burs a-p as t oris, Mcench. Usually somewhat hirsute at base, 12 to 18 

 inches high, branching : radical leaves mostly runcinate-pinnatifid, the cauline lan- 

 ceolate auricled at base, toothed or entire : pods cuneate-triangular, truncate above, 

 1 to 2 lines long and broad : pedicels widely spreading : seeds numerous, minute. 



Originally from Europe, now naturalized as a harmless weed over most of the civilized world ; 

 known as Shepherd's Purse. 



22. LYROCARPA, Hook. & Harv. 



Pod fiddle-shaped or reniform-obcordate, strongly flattened laterally, somewhat 

 acutely carinate : cells 2 - 5-seeded. Seeds rounded, flattened, narrowly winged : 

 cotyledons accumbent. Style very short : stigma 2-lobed. — Pubescent annuals ; 

 leaves lyrately pinnatifid, petioled ; flowers purplish, with long narrow calyx. 



1. L. Coulteri, Hook. & Harv. Canescently pubescent throughout with branched 

 hairs ; stem about a foot high, loosely branched : leaves all petioled, oblong, lyrately 

 pinnatifid, 1 to 2 inches long : flowers in a very open raceme, spreading or deflexed : 

 petals linear, acuminate, 9 lines long : pods fiddle-shaped, 6 to 8 lines long, 4 to 5 

 wide, pubescent : stigma dilated, depressed. — Lond. Jour. Bot. iv. 76, t. 4. 



Collected only by Coulter, the precise locality unknown ; probably in S. California or W. 

 Arizona. An immature specimen from Cape San Lucas (Xantus) is perhaps distinct, having 

 shorter petals, with a dilated blade, and a less depressed conical stigma. 



L. Palmeri, Watson, Proc. Am. Acad. xi. 123, from the Big Caiion of the Tantillas Mountains, 

 below San Diego, differs from the original type of the genus in its reniform-obcordate pod, 4 to 5 

 lines wide, with 2-seeded cells ; upper seed horizontal, the lower pendulous : petals linear. 



