174 CRUCIFER^. Thelypodium. 



purple white or very rarely yellow flowers (mostly smaller than in Gaulanthus) 

 usually in rather dense racemes. — Gen. 876 ; Wats. Bot. King Exp. 25, & Bibl. 

 Index, 72 ; Brew. & Wats. Bot. Calif, i. 37 ; Prantl, I. c. 155. Pachypodvmn, 

 Nutt. in Torr. & Gray, Fl. i. 96; Benth. & Hook. Gen. i. 81. [By B. L. 

 Robinson.] 



§ 1. IIesperidanthus. Stigma ovate, entire, with a more or less conical 

 apex : flowers large, purple : petals with obovate blade : cauline leaves narrow, 

 not auriculate. 



T. linearif olium, Watson. An erect smooth perennial, 2 or 3 feet high, with pale foliage 

 and somewhat corymbosely branched above : basal leaves obovate, sharply toothed, not per- 

 sisting ; cauline linear or linear-oblong, entire, ascending : petals showy, rose-purple, slender- 

 clawed, 10 lines in length : pods slender, 2 to 3 inches long, ascending or erect upon slender 

 spreading pedicels. — Bot. King Exp. 25 ; Proc. Am. Acad. xvii. 321. Streptanthus lineari- 

 folius, Gray, PI. Fendl. 7. lodunthus or Pachi/podium linearif olium , Gray, Proc. Am. Acad, 

 vi. 187. — Colorado to Texas and Arizona. (Northern Mex.) A species without close 

 affinities in the genus and with flowers and stigma somewhat of Hesperis matronalis. 



§ 2. EuTHELYPODiuM. Style slender or short and thick, or obsolete, truncate 

 or slightly 2-lobed ; stigmatic surface circular or elongated over the valves (ex- 

 cept in T. elegans) : pubescence simple or none. 



* Upper cauline leaves sessile, cordate, or auriculate : pedicels very short, almost none : 

 siliques arcuate, strongly deflexed. 



T. Cooperi, Watson. Slender erect annvial : stems terete, flexuous, glabrous, usually 

 branched, 8 inches to 1| feet in height : leaves thickish, oblong, obtusish, the basal shallowly 

 ■ few-toothed, the others entire, cordate, or sagittate with clasping lobes ; the uppermost and 

 rameal leaves narrower, lance-linear ; all tending to fall off, leaving the stem quite naked at 

 fruiting : flowers small : sepals 1^ to 2 lines long, somewliat exceeded by the purplish petals; 

 the latter narrower than usual in the genus : siliques 1 J inches long, attenuate at the end, 

 commonly falcate, somewhat scabrous with flue stiff hairs. — Proc. Am. Acad. xii. 246, & 



Bil)l. Index, 451. T. ? Brew. & Wats. Bot. Calif, i. 38. — S. E. California, Fort 



Mohave, Cooper ; Mohave River, Palmer ; Cashenberry Springs, Mohave Desert, Parish ; 

 Inyo Co., Coville & Funfiton ; Colorado Desert, Orcutt ; Arizona, Palmer ; fl. April to June. 

 A very distinct species, suggesting by its habit and fruiting racemes Arabis longirostris, Wats. 



* * Upper cauline leaves sessile, cordate-clasping or auriculate at the base : capsules erect, 

 ascending or widely spreading, 6 to 15 lines in length (the mature fruit of T. eucosmum 

 still unknown, perhaps somewhat longer). 



-1— Flowers even in anthesis subspicate or racemose, i. e. opening in young inflorescences 

 considerably below the bud-bearing apex of the rhachis. 



■H- Inflorescence very dense and spike-like : flowers white or nearly so. 



T. bracliycarpum, Torr. Erect, 1^ to 2| feet high, sim])le or branched, quite smooth or 

 somewhat his]ii(I-])nbescent below: stem becoming stout : leaves thickish; the basal oblong 

 or oblanceolate, sinuate-toothed or pinnatifid; the cauline as in the preceding: racemes 

 very dense and spike-like ; fruiting pedicels 1 to 1^ lines long : flowers small, white : sepals 

 linear, nearly or quite equal at the base : petals narrow, much exserted : siliques slender, 

 terete, somewliat knotted, slender-stiped and sharply beaked, 8 to 10 lines in length, ascend- 

 ing. — Bot. Wilkes Exped. 231, t. 1 ; Gray, Proc. Am. Acad. vi. 520 ; Wats. Bot. King Exp. 

 25,26; Brew. & Wats. Bot. Calif, i. 37. — Abundant in meadows and mountain valleys, 

 W. Nevada to Central and N. California ; fl. May to August. Said to have the odor and 

 taste of cabbage. 



•H- ++ Inflorescence laxer : flowers roseate or purple. 



T. Howellii, Watson. Erect or somewhat deciimbent, slender, quite simple or with several 

 slender simple ascending branches, hispid-pubescent near the base, glabrous above : radical 

 leaves numerous, rosulate, about an inch in length, oblanceolate, obtusish, coarsely toothed. 



