106 CKUCIFERJ::. Draba. 



higher regious the characters become obscured and limits of species ill defiued. 

 Some South American species are suffruticose and have showy violet-colored 

 flowers. — Cat. PI. Giss. App. 122; L. Gen. no. 535; Gray, Gen. 111. i. 159, 

 t. 68, 69; Benth. & Hook. Gen. i. 74; Wats. Proc. Am. Acad, xxiii. 255. 

 [By S. Watson.] 



§ 1. Ekophila, Koch. Petals biiid: flowers white : pods many-seeded, round- 

 oval to oblong : stellate-pubescent scapose winter-annuals with coarsely toothed 

 or entire leaves. — Syn. 65.^ 

 D. VEUNA, L. (Whitlow-grass.) Leaves rosulate; oblong-obovate to oblaaceolate : scapes 



very slender, glabrous or nearly so, 2 to 6 inclies high : pods glabrous, rouud-oval to oblong, 



2 to 4 lines long, shorter than the spreading pedicels; stigma nearly sessile. — Spec. ii. 642; 



Barton, Fl. N. A. iii. 49, t. 88, f. 2 ; Gray, 1. c. t. 69. D. vernu, var. Ameriama, I'ers. Syn. 



ii. 190. Erophila Americana, DC. Syst. ii. 356. E. vulgaris, DC. 1. c. ; Hook. Fl. Bor.-Am. 



i. 56. — Quebec to Georgia, 6'Aa/)«ia?(, and west to Minnesota and Missouri; Washington 



and Vancouver Isl. ; fl. early.^ (Nat. from Eu.) 



§ 2. Hetekodraba, ^Yatson. Pedicels reflexed, secund : seeds 6 to 10, his- 

 pidulous : branching short-caulescent winter-annual, stellate-pubescent ; the leaves 

 coarsely toothed or entire : flowers white. — Proc. Am. Acad, xxiii. 256. Hetero- 

 draba, Greene, Bull. Calif. Acad. Sci. 1.71. 



D. unilateralis, M. E. -Jones. Branching from the base ; branches spreading, elongated, 

 lax, leafy below : leaves cuneate-obovate to oblauceolate, an inch long or less : racemes 

 usuidly nearly sessile : flowers very small : sili^ues round-oval, somewhat twisted, pubescent, 

 distant, 2 or 3 lines long, on pedicels a line long or less, 12-seeded ; stigma sessile. — Bull. 

 Torr. Club, ix. 124. Heterodraba unilateralis, Greene, 1. c. 72. — Valleys of California from 

 Colusa County to All Saints Bay, Lower Calif. 



§ 3. Drabella, DC. Short-caulescent and more or less leafy winter- 

 annuals (rarely biennial in D. crassifoUa ; scapose in D. asprella and D. eras- 

 si folia) : pubescence stellate or more or less villous : pedicels not reflexed : petals 

 entire or emarginate: seeds smooth. — Syst. ii. 332, 351. 



* Early spring species of valleys and hillsides ; southern. 

 •*- Leaves entire : flowers white : pedicels clustered or approximate. 

 D. Caroliniana, Walt. Very .slender, n.sually branched; branches often decumbent : 

 leaves obovate to oblanceolate, obtuse or acute, loosely stellate-pubescent, 6 lines long or 

 ' less : scape-like peduncles glal)rous or pubescent, 1 to 4 inches higli : flowers small : pods 

 clustered or a])proximate, glabrous, linear, 3 to 9 lines long, much exceeding the spreading 

 pedicels; stigma sessile. — Car. 174; Torr. & Gray, Fl. i. 109. (Paroni/chia Myosotis Vir- 

 qiniana, Pluk. Aim. t. 51. f. 5.) D. hispifluin, Michx. Fl. ii. 28. Arabis reptans, Lam. Diet, 

 i. 222. A. Totundifolin, Raf. Am. Monthly Mag. ii. 43. — E. Ma.ssachusetts, J. Robinson, to 

 the northern shores of Lakes Erie and Ontario, Macoun, Minnesota, Arkansas, and Georgia ; 

 Umatilla, Oregon, Hou-ell Bros. 



Var. micrantha, Gray. Pods hispid with- short sub-appressed hairs.— Man. ed. 5, 

 72. D. micrantha, Nutt. in Torr. & Gray. Fl. i. 109. — Illinois to Nebraska, Texas, and 

 New Mexico ; Utah,^ Watson : Mt. Helena, Montana, Catibi/ ; Idaho, Spalding ; Klikitat Co., 

 Washington, Snksdorf. 



1 Add syn. Gansblnm, Adans. Fam. ii. 420. Erophila, DC. Syst. ii. S.'JG. 



2 This species is a noteworthy aggregate of similar forms, distinguished from each other by mmute 

 but apparently constant characters, and is sometimes regarded as a group of many very closely related 

 species. (See Rosen, Hot. Zeit. xlvii. 565 ; Prantl in Engl. & Prantl, Nat. Ptlan/enf. iii. Ab. 2, 190.) 

 Tlie constancy of trivial characters is doubtless due to close fertilization prevalent in these plants. 



8 Reported from the Panaiiiint Mountains, Calil"., by Coville, Contrib. U. S. Nat. Herb. iv. 6S. 



