MACLOSKIE I CRUCIFER^E. 429 



1. THLASPI ALPESTRE Linn. 



Leaves entire, the radical ovate, petiolate, the cauline oblong, amplexi- 

 caul. Petals about equal to sepals. Silicles obcordate, 8-i2-seeded; 

 their valves winged dorsally. Style filiform. Seeds not striate. 



(European Mts.); Cordilleras of S. Patagon. 



2. T. GLAUCOPHYLLUM Bam. 



Cespitose. Stems leafy, glabrous, erect, simple. Leaves glaucous, 

 glabrous ; the radical oblong, attenuate, petiolate, entire ; the cauline ses- 

 sile, ovate, basi-auriculate. Flowers white, corymbed. Silicic oblong- 

 obovate, not winged, lo-seeded, submarginate. Style nearly half as long 

 as the ovary. 



(Chili) ; S. Patagon., by R. Sta. Cruz. 



3. T. MAGELLANICUM Pers. 



Perennial, 7 cm. high. Radical leaves oval-spatulate, stalked, almost 

 entire ; cauline oblong-sessile. Flowers small, white. Petals about equal 

 to sepals. Silicle obovoid, truncately-emarginate. Style short. Seeds 8, 

 oval-oblong, rufous, flat, not striate. 



Magellan, at Sta. Magdalena by Cunningham ; Rio Coy (Hatcher) ; E. 

 and N. and S. Fuegia; "a steppe plant" (Dusen). Over nearly all 

 Patagonia. "Seeming not to differ from T. andicola H. & A. The 

 characters by which Reiche differentiates these are all fallacious." (Speg.) 



7. SISYMBRIUM Linn. 



Silique linear or linear-oblong, sessile, style short. Sepals subequal at 

 base. Seeds i -seriate, ovate or oblong, not margined. Cotyledons incum- 

 bent. Annual or biennial herbs with toothed or pinnatifid leaves, and 

 simple pubescence. Species 50, widely distributed. 



KEY TO THE SPECIES. 



A. Leaves entire, linear. Glabrous, cespitose plants. patagonicum. 



A2. Leaves oblong, the cauline sagittate. Flowers white ; stigmas 2-lobed. andinum. 

 A$. Leaves variously pinnatifid. Flowers yellow. 



b. Leaves runcinate-pinnatifid. Siliques linear-acuminate, appressed to stem, officinale. 



