520 PATAGONIAN EXPEDITIONS I BOTANY. 



Standard broad-orbicular, dorsally silky, its margins inflexed. Wings 

 lobed, bearded inside. Fruit ? 



S. Patagon. at Puerto Deseado (by Charles Darwin) ; Chonkenk-aike, 

 "abounding in sandy places, yet the legumes are unknown." (Speg.) 



34. PATAGONIUM SYLVESTRII Speg. 



Unarmed. Ptilocarpum. Low, woody, perennial. Branches lax, 

 about 12 cm. long, fuscous-brown, glabrous, laxly leafy. Leaves impari- 

 pinnate, the petioles folioliferous from the lowest third. Leaflets usually 

 obovate, thickish, entire, nerveless, glabrous or upper surface appressed 

 and obsoletely puberulous. Stiptdes fuscous, their lobes short, acute, 

 pallid on margin. Racemes often very long, flexuose, lax-flowered, black- 

 purple, with a shorter pedicel. Laments i -jointed, black-purple, with 

 white plumose setulae. 



S. Patagon by Rio Sta. Cruz, near Lago Argentino. 



35- P. TEHUELCHUM (Speg.). 



Unarmed ; laxly racemed. Perennial, quasi-glabrous, really hispid. 

 Branches subsimple, remotely leaf-bearing. Leaflets on upper half of 

 petioles, 3 pairs, thick, spatulate. Racemes terminal on the branches. 

 Calyx-teeth long. Corolla orange, twice as long. Legume many-jointed. 



Chubut, in dry places near Lago Musters ; S. Patagon., along Rio 

 Scheuen, branch of Rio Chico. 



36. P. TRIFOLIATUM (Gill.) O. Ktze. 



Ptilocarpum. Unarmed ; hoary-pilose, perennial, with many short 

 branches from the crown of the root, 5-10 cm. high, often decumbent. 

 Leaves 3-foliolate, alternate, becoming smaller and more crowded up- 

 wards. Stipules lanceolate. Leaflets elliptical-obovate, rounded, entire, 

 green-hoary on epiphyll, white tomentose on hypophyll. Racemes axillary, 

 shorter than the leaf, the lower half of the rachis bare, upper part crowded. 

 Flowers refract, small ; calyx hoary-villous, 5-toothed more than half-way 

 down. Corolla slightly larger than calyx, the vexillum orange, dorsally 

 purplish and villous, equalling the orange wings and keel. Legume 

 refract-1 i near, .3-4-join ted, with few, plumose setulae. 



N. Patagon., near Fort Roca. 



(P. trifoliatum (Ph.) Reiche, must be called P. triphyllum (Ph.) Speg., 

 a Chilian form.) 



