MACLOSKIE: CRUCIFER^;. 441 



I. BURSA BURSA-PASTORIS (L.) Brit. 



Flowers white. Stem-leaves few, auricled-dentate to entire. 

 Patagon., near Rawson (Dusen) ; Magellan ; Fuegia, Ushuaia. 



2. B. PROCUMBENS (Linn.) O. Ktze. (Phitchinsia Hook, f.) 

 Dwarf, 3-8 cm. high. Leaves entire or deeply toothed, not pinnatifid. 



Racemes elongated and open in fruit. Petals as long as the calyx. 



Capsule narrowed at both ends. 



(New Zealand) ; Patagon., near Lago Argentine, by Golfo de San 



Jorge, and Rio Chubut. 



15. DRABA Linn. Whitlow-grass. 



Low, mostly stellate- hairy, with simple, often rosulate leaves and mostly 

 bractless racemes. Silicles elliptic or oblong, or long, like siliques, flat. 

 Stigma subentire. Seeds 2-seriate, wingless. Cotyledons accumbent. 



Species 150, N. Temperate and Arctic; few in Southern S. Amer. 



KEY TO THE SPECIES. 



A. Small, hirsute below with stellate hairs ; scape naked above. 



b. Flowers green, apetalous. Silique with simple hairs. ameghinoi. 



b2. Flowers small, white. Silique glabrous. argentina. 



A2. Low, radical leaves oblong-lance, silky above. Pedicels and silicles glabrous, australis. 

 AT,. Stems mostly short. 

 b. Stellate-hairy. 



c. Leaves obovate, oblong. Flowers small ; on long naked peduncles. brackenridgei. 



c2. Leaves linear, obtuse. saffordi. 

 3. Leaves lanceolate to ovate. Erect or branching. Silicles twisted when ripe. 



incana. 



c4. Leaves oblong. Ripe silicles twisted on long pedicels. gillesii. 



b2. Silky-hirsute, ovate-lanceolate leaves. falklandica. 

 b$. Glabrous. 



c. Leaves linear-lanceolate, ciliate-toothed. funiculosa. 

 c2. Cespitose. Leaves fasciculate, narrow. . 



d. Leaves long, acutish. graminifolia. 



d2. Leaves narrow-linear, subobtuse. oligosperma. 

 c^. Fleshy. 



d. Leaves orbicular to obovate, toothed or incised. karraikensis. 



d2. Leaves oblong linear, often ciliate, margined. monantha. 

 A^.. Stems several, leafy ; leaves glabrous. 



b. Leaves long-spatulate to oblong-linear. depilis. 



b2. Leaves oblanceolate, subterminally rosulate. Flowers crowded, bracted. hatcheriana. 



b$. Leaves pinnatifid, toothed and ciliate. patagonica. 



