New Species of South American Plants 23 



Lepidium angustifoliutn. 



Gray-green, with closely appressed fine hairs. Stems simple, 

 I to 2 dm. high, ascending from an annual root, very slender, 

 leafy almost to the flowering portion. Leaves 1.5 to 3 cm. long, 

 1.5 to 3 mm. wide, linear-oblanceolate, obtuse, gradually nar- 

 rowed into a petiole-like base, entire, thin, the venation not 

 perceptible. Inflorescence elongated, loose, without bracts. 

 Pedicals in flower 5 or 6 mm. long, in fruit, but little longer. 

 Sepals 1.5 mm. long and a little more than half as wide, oval, 

 obtuse, thickish, green with purplish tips. Petals white and 

 purplish, 4 mm. long, 2.5 mm. wide, the claw a fourth of the 

 length, the limb oval-elliptical. Stamens more than half the 

 length of the petals, the filaments rather stout. Pistil half the 

 length of the petals, the ovary oval, a little longer than the 

 stout style, the stigma large, capitate. Capsule 3 mm. long, 

 including the very short persistent style, two-thirds as wide, 

 oval and nearly elliptical, green with purple margin. 



"La Paz, Bolivia, by side of river, along road to Obrajes, 

 3,500 meters, May." (Otto Buchtien, No. 2848.) 



Radicula scabra. 



Gray-green and rough-hairy throughout. Stems to 8 or 

 10 cm. long, prostrate or ascending, densely massed, stoutish 

 but weak, somewhat branching. Radical leaves in a dense 

 rosette, 4 to 7 cm. long, 6 to 10 mm. wide, oblanceolats in gen- 

 eral outline, gradually narrowed into a margined petiole of 

 variable length, pinnatifid, the divisions successively smaller 

 and more remote toward the base, the larger ones 4 or 5 mm. 

 long and nearly as wide, ovate or obovate, obtuse or acutish, 

 entire or some obscurely crenate-dentate, the base broad, thick. 

 Flowers in a terminal, leafy-bracted raceme, the pedicels very 

 short. Calyx 2 mm. long, ovate, obtuse, thin, concave. Petals 

 a little longer than the sepals, spatulate, unguiculate. Stamens 

 of same length, the filaments thick, the anthers very small, 

 oblong, versatile. Ovary longer than perigone, pilose, oval, 

 the style very short and thick, the stigma capitate. Pod 7 mm. 

 long, 2.5 mm. wide, oblong, lightly compressed, straight or slightly 

 curved, the sepals persistent, tipped by the short style, rough- 

 hairy. Seeds on filiform funicles, compressed, sub-rotund. 



La Paz, Bolivia, 4,100 meters altitude, April 1910. (Otto 

 Buchtien, No. 587). No. 2846, La Paz, 4,000 meters altitude, 

 March 1910, is the same. 



"Mathewsia diffusa Rusby", Bull. N. Y. Bot. Gard. 

 4:322 (1907), proves to be an extremely large and robust form 

 of a Radicula, with woody base, perhaps R. nana (Wedel.) n. comb. 



