180 ROSACEAE. 



becoming dry achenes in fruit. Style filiform, lateral, 

 attached at the middle of the ovary, somewhat persist- 

 ent. Seeds ascending and amphitropous. 



1. A. anserina (L.) Rydb. Main stem inconspicuous, producing 

 many long runners; leaves 1-2 dm. long, abruptly pinnate with 

 9-31 larger leaflets and with smaller ones interposed, usually pros- 

 trate, slightly silky and green above, white-silky and tomentose 

 beneath; larger leaflets oblanceolate, 1-3 cm. long, deeply and sharply 

 serrate; flowers 1-2 cm, broad, on pedicels 3-20 cm. long; petals 

 much exceeding the calyx. 



Rather common in damp ground in the valleys. Flowering 

 through the summer. {Potentilla anserina L.) 



5. DRYMOCALLIS Fourr. 



Erect more or less glandular or viscid herbs from 

 perennial rootstocks, with pinnate leaves and cymose 

 yellow 5-merous bracteolate flowers. Calyx saucer- 

 shaped or hemispheric. Petals obovate, elliptic or nearly 

 orbicular, obtuse. Stamens 20-30 on a persistent disk 

 at base of receptacle. Receptacle hemispheric with 

 numerous pistils which become dry achenes. Style 

 basal, slightly thickened and glandular below, tapering 

 at both ends or nearly filiform, rather persistent. Seed 

 attached near the base, ascending, orthotropous. 



1. D. glandulosa (Lindl.) Rydb. Stem erect, 3-6 dm. high, 

 rather slender, slightly striate, viscid and glandular hairy at least 

 above, nearly simple below, branched above ; lower stipules lanceolate, 

 the upper ovate and usually deeply toothed; basal leaves petioled, 

 pinnate; leaflets 3-4 pairs, sparingly hairy, nearly glabrous above, 

 obovate, mostly obtuse, simply or double serrate with broad teeth, 

 1-3 cm. long, the upper generally somewhat larger; cauline leaves 

 short petioled, with 1-3 pairs of leaflets; flowers in an open many- 

 flowered cyme, 10-15 mm. broad; bractlets linear-lanceolate, much 

 shorter than the oblong or obovate-lanceolate acute sepals; petals 

 obovate, about equaling the sepals, stamens 25. {Potentilla glandu- 

 losa Lindl.) 



Frequent in the chaparral belt in all the mountains. Ours not 

 typical, having usually smaller flowers and less acute sepals. March- 

 July. 



la. D. glandulosa monticola Rydb. A more slender and smaller 

 mountain form with smaller leaflets, more open but smaller cymes, 

 shorter sepals, pale yellow petals, and often only 20 stamens. {Po- 

 tentilla glandulosa nevadensis Wats.) 



Frequent in the pine belt of all our mountains. May-August. 



