442 . PATAGONIAN EXPEDITIONS : BOTANY. 



i. DRABA AUSTRALIS AMEGHINOI Speg. (D. ameghinoi Speg.) 

 (Drabella.] Small, hirsute annual, with rosulate, elliptic leaves, or 

 obovate, stellately pubescent, entire. Scapes simple, or forked at the base, 

 leafy, stellately hairy below, naked above. Flowers spicately racemose, 

 green, with few simple hairs ; petals none. Siliqiie large, elliptical, with 

 small, simple hairs. (More robust than D. argentea, and distinguished 

 by its hairy silique.) 



Patagon., stony planes by Golfo de San Jorge. 



2. D. ARGENTINA Speg. 



(Drabella.} Small, hirsute annual. Leaves chiefly rosulate, lanceo- 

 late to nearly ovate, acute-rounded above, attenuate below, sessile, entire, 

 rough, with white spreading, stellate hairs. Scapes simple or branching, 

 slender, glabrous, but with some stellate hairs, naked above. Flowers 

 racemosely spicate, very small, white, glabrous. Silique glabrous, rather 

 large, elliptical, on a smaller pedicel. 



(S. Argent, near Bahia Blanca) ; Patagon., by Golfe de San Jorge; by 

 Rio Sta. Cruz. 



D. ARGENTINA GRANDIFOLIA Speg. 



Flowers larger, the white petals twice as long as the green sepals. 



D. ARGENTINA LATIFOLIA Speg. 



Leaves orbicular, or elliptic-obtuse, margin obsoletely repand. 



3- D. AUSTRALIS Hook. f. 



Low annual, with subsimple stem, few radical leaves rosulate, oblong- 

 lanceolate, entire, obtuse, with silky, simple hairs on epiphyl, and stellate 

 hairs on hypophyl. Flowers white. Pedicels in fruit filiform, half as long 

 as the linear-oblong silicle. Peduncles and silicles glabrous. 



Bahia Blanca to Patagon., Rio Sta. Cruz, Puerto Madryn ; N. and E. 

 Fuegia (Ansorge, Dusen, Hatcher). 



4. D. BRACKENRIDGEI A. Gray. 



Stem short, 2-5 cm., divided from the perennial root, stellate-hoary. 

 Leaves crowded, obovate, oblong, obtuse, 5 mm. long. Peduncles long, 

 naked ; racemes dense. Flowers small, white. Silicles oblong to lance- 

 elliptical, hairy. Style short. Valves rather plane. 



(Bolivia. ) Patagonia ( ? ) . 



