114 CRUCIFER^. Senebiera. 



—DC.syst.2.p.38l; Deless. ic.2. t. 52; Hook. fl. Bor.-Am. 1. p. 58; 

 Nutt. ! in jour. acad. Philad. 7. p. 13. 



Head waters of the Oregon! April-May. — If Somewhat glaucous, 

 about a span high. Stem simple, or a little branching at the base. Radical 

 leaves abruptly narrowed into a petiole, mostly entire, or with one or two mi- 

 nute teeth ; the limb half an inch long. Petals obovate-oblong. Pedicels 3 

 times as long as the silicles, diverging horizontally. — Scarcely to be distin- 

 guished from T. montanum. 



5. T. alpestre (Linn.) : leaves entire or obscurely toothed ; radical ones 

 ovate, petioled ; cauline ones oblong, clasping ; petals about as long as the 

 calyx ; silicles obcordate, 8-12-seeded ; style filiform. UC. prodr. 1. p. 176 ; 

 Hook.Jl. Bor.-Am. l.p. 58. 



Canada. Introduced 1 



6. T. tuberosum f Nutt.) : leaves rhomboidal-ovate, obscurely toothed, ses- 

 sile ; radical toes in long petioles ; stem simple, pubescent; root tuberiferous 

 and fibrillose. Nutt. gen. 2. p. 65 ; DC. prodr. 1. p. 177. 



Western Pennsylvania, Nuttall. April-May.— H: Plant 4-5 inches high. 

 Flowers rather large, rose-color. Silicle somewhat orbicular. Nutt. 



34. HUT CHIN SI A. R. Br. in hort. Kew. 4. p. 82 ; DC. syst. 2. p. 385. 



Silicle elliptical ; valves wingless ; cells 2- (rarely many-) seeded. Calyx 

 equal. Petals equal. 



1. H. calycina (Desv.) : canescently tomentose ; leaves mostly radical, 

 on long petioles, deeply pinnatifid ; calyx persistent ; silicles oblong, attenuate 

 at each end, pointed with the style. Hook.— Desv. jour. hot. 3. p. 168 ; DC. 

 prodr. l.p. 178 ; Hook.Jl. Bor.-Am. l.p. 58. t. 11. f. B. 



0. lower leaves allentu-e. Hook. I. c. 



Rocky Mountains, lat. 52°-57^. 0. Kotzebue's Sound.— Root ligneous. 

 Stem 3-4 inches high. Flowers white, in dense corymbs : Umb of the petals 

 roundish. Ovary oblong, somewhat hirsute. 



Tribe VIII. LEPIDINE.E. DC. 



Silicle usually dehiscent, compressed contrary to the narrow septum 

 (sometimes l-celled) ; valves boat-shaped (or rarely ventricose). Co- 

 tyledons plane, incumbent, parallel to the septum. 



35. SENEBIERA. Poir. diet. 7. p. 75 ; DC. syst. 2. p. 521. 



Silicle didymous ; valves ventricose or somewhat carinate, partly indehis- 

 cent; cells 1-seeded. Seeds globose-triquetrous. Cotyledons linear.— Ra- 

 cemes opposite the leaves. Flowers white. 



1. S. pinnatijida (DC): leaves pinnately divided; lobes oblong, toothed 

 or somewhat incised ; silicles compressed, emarginate at the apex, reticulate- 

 rugose. DC. prodr. l.p. 20Z. 



0. incisa (DC.) : lobes of the leaves 3-4-parted. DC. I. c— S. incisa, 

 Willd. enum. 2. p. 268. Biscutella apetala, Walt. Car. p. 174. Cochlearia 

 humifusa, Michx. ! fi. 2. p. 27. Coronopus didyma, Pursh, jl. 2. p. 434; 

 Nutt. ! gen. 2. p. 65 ; Ell sk. 2. p. 139. 



Fields and along rivers, North Carolina! to Louisiana ! west to Arkansas! 

 Feb.-July.— ® or @ Stems prostrate. Petals minute or none. 



