ROSACEAE. 181 



6. HORKELIA Cham. & Sch. 



Perennial herbs with a thick woody caudex or root- 

 stock covered with brown scales, pinnate leaves and 

 cymose flowers. Calyx deeply campanulate to saucer- 

 shaped, deeply 5-lobed, with 5 bractlets alternating with 

 the lobes. Petals variable, unguiculate, white or rarely 

 pale yellow. Stamens 5-20, inserted in the throat of the 

 calyx-tube and remote from the base of receptacle; fila- 

 ments dilated, petaloid. Receptacle hemispheric or 

 conic with numerous pistils. Styles long and slender, 

 generally thickened and somew^hat glandular at base, 

 deciduous. Ovules and seeds pendulous, anatropous. 



1. H. sericea (Gray) Rydb. Stem rather stout, 3-6 dm. high, 

 siiky-pubescent, scarcely glandular; stipules ovate or lanceolate, 

 1-2 cm. long, often toothed; basal leaves numerous, rather short- 

 petioled; leaflets 4-7 pairs, rather thick, densely and finely silky- 

 canescent, obovate, 1-2.5 cm. long, rather coarsely somewhat 

 crenately toothed, the upper confluent; cauline leaves similar but 

 smaller with 2-5 pairs of leaflets; cyme rather dense; calyx cupulate; 

 bractlets entire, ovate or ovate-lanceolate; lobes similar, slightly 

 exceeding the bractlets; petals white, spatulate, 5-6 mm. long. {H. 

 calif ornica sericea Gray.) 



Near Playa del Rey, not otherwise known south of Santa Barbara. 

 March-May. 



2. H. puberula (Greene) Rydb. Stems mostly several, 3-6 dm. 

 high, branched, finely glandular-puberulent, leafy; stipules obovate, 

 often toothed; basal leaves numerous, puberulent or glabrate; 

 leaflets 5-8 pairs, obovate or cuneate-oblong, 1-2.5 cm. long; flowers 

 about 1 cm. broad; calyx-tube cupulate; bractlets broadly lanceolate, 

 exceeded by the ovate-lanceolate calyx-lobes; petals oblong-spatu- 

 late, scarcely exceeding the calyx-lobes. (H. platycalyx Rydb.) 



Frequent in the foothills, mostly below 3000 feet altitude. March- 

 May. 



7. CERCOCARPUS H. B. K. Mountain Mahogany. 



Unarmed evergreen shrubs or trees with simple stipu- 

 late leaves and small axillary or terminal solitary or 

 somewhat fascicled apetalous flowers. Calyx salver- 

 shaped, the 5-lobed limb deciduous. Stamens many, in 

 2 or 3 rows on the limb of the calyx. Pistil 1 ; style ter- 

 minal; ovule solitary, ascending. Fruit a coriaceous 

 terete villous achene, included in the elongated calyx- 

 tube, caudate with the elongated plumose twisted style. 

 Seed linear; endosperm none. 



