ROSACEAE. 179 



ing the petals; ovaries tomentose; fruit separating from the re- 

 ceptacle when ripe, yellowish red with a white bloom and agreeable 

 flavor. 



Occasional in all our mountains in the pine belt. May-June. 



3. R. vitifolius C. & S. (Bramble or Blackberry.) Stems 

 woody, weak and trailing or suberect, somewhat glaucous, armed 

 with straight, slender prickles, 1-6 m. long; leaves pinnately 3-5- 

 foliate or those of the flowering branches only deeply lobed; leaflets 

 ovate to oblong, coarsely toothed, glabrous or more or less pubes- 

 cent; flowers imperfect, staminate large with elongated petals; 

 pistillate small with broad petals; fruit persistent on the receptacle, 

 oblong, black and sweet. 



Frequent in the foothills and valleys, mostly along streams. 

 January-April. 



3. POTENTILLA L. 



Ours perennial or rarely annual herbs with digitately 

 or pinnately compound leaves and cymose yellow perfect 

 flowers. Calyx persistent, its tube concave or hemi- 

 spheric, 5-bracteolate, 5-lobed. Petals 5, mostly obovate 

 and emarginate. Stamens commonly 20, inserted on 

 an annular disk very near the base of the receptacle; 

 filaments filiform or spatulate but not flattened. Pistils 

 many, becoming dry achenes in fruit, inserted on a 

 hemispheric or conic receptacle; style terminal or nearly 

 so, deciduous; ovules pendulous, anatropous. 



1. P. multijuga Lehm. Perennial; stems erect, 3-7 dm. high, 

 slightly silky-strigose, more or less leafy; stipules large, 1-2 cm. 

 long, ovate, entire; basal leaves numerous, often 2-3 dm. long, 

 slightly hairy or glabrate, pinnate w^ith 6-13 pairs ot leaflets; leaf- 

 lets obovate, cuneate, 1-4 cm. long, coarsely toothed above the 

 middle; cauline leaves smaller and with fewer leaflets; flowers about 

 15 mm. broad, in rather narrow cymes; pedicels slender; bractlets 

 oblong, about | as long as the ovate calyx-lobes; petals broadly 

 obcordate, about I longer than the calyx-lobes; style filiform. 



Playa del Rey, Hasse. A rare plant not otherwise known. 



4. ARGENTINA Lam. 



Perennial herbs growing in damp ground and spread- 

 ing by slender runners, with thick and fascicled roots 

 and pinnate leaves. Flowers borne on simple pedicels 

 from the axils of the leaves formed on the runners, 

 5-merous and with 5 bractlets. Calyx nearly wheel- 

 shaped. Petals yellow, broadly elliptic to nearly orbicu- 

 lar, obtuse. Stamens 20-25, inserted closely around the 

 base of the receptacle; filaments filiform, rather short. 

 Receptacle hemispheric, bearing numerous pistils, these 



