Vol.. II.] ROSE FAMILY. 



3. Dry as Drummondii Richards. 



Drummond's Mountain Avens. 



(Fig. 1951.) 



Dryas Drummondii Richards.; Hook. Bot. Mag. pi. 

 2972. 1830. 



Dryas octopetala var. Drummondii S. Wats. Bibliog. 

 Index, i: 281. 1878. 



Similar to D. octopelala, the leaves crenate-den- 

 tate, but generally narrowed at the base. Scape 

 floccose-pubescent, often taller; flower yellow, 

 about 9 X/ broad; sepals ovate, acutish, black glan- 

 dular-pubesce n t. 



On gravel, Gaspe, Quebec; Anticosti and Labrador, 

 throughout arctic America, and in the Canadian Rocky 

 Mountains. June-Aug. 



223 



15- CERCOCARPUS H.B.K. Nov. Gen. et Sp. 6: 232. 1823. 



Shrubs or small trees, with alternate simple petioled coriaceous dentate or entire, stipu- 

 late, prominently straight- veined leaves, and short-pedicelled or sessile, solitary or clustered, 

 axillary or terminal, perfect flowers. Calyx narrowly tubular, persistent, contracted at the 

 throat, 5-lobed. Petals none. Stamens 15-25, inserted in 2 or 3 rows on the limb of the 

 calyx; filaments very short; anthers oval, often pubescent. Ovary i, terete, slender, in- 

 cluded in the calyx-tube, ripening into a villous achene; style filiform, villous, persistent, 

 plumose and elongated in fruit; stigma obtuse; ovule solitary, nearly erect. Seed linear, 

 its testa membranous. [Greek, tailed-fruit. ] 



About 6 species, natives of western North America and Mexico. 



i. Cercocarpus parvifolius H. & A. 

 Small-leaved Cercocarpus. (Fig. 1952.) 



Cercocarf>us parvifolius H. & A. Bot. Beechey 05-, 

 337- 1841- 



A low branching shrub. Leaves obovate or oval, 

 coriaceous, obtuse at the apex, cuneate or some- 

 times rounded at the base, short-petioled, dentate, 

 silky-pubescent or canescent below, sparingly so 

 or glabrous above, 6 // -i2 // long, 3 "-8" broad; 

 flowers axillary, solitary or in pairs, short-pedun- 

 cled, recurved, about 3" broad; calyx-tube pubes- 

 cent, 4 // -6 // long, its limb deciduous; style becom- 

 ing 2 / -4 / long and very plumose in fruit. 



In dry or rocky soil, South Dakota and western 

 Kansas to northern Mexico, west to California. April- 

 June. 



16. 



ULMARIA Hill. Hort. Kew. 213. 1769. 



Tall perennial herbs, with alternate petioled pinnately divided stipulate leaves, and small 

 white pink or purple perfect flowers in large cymose panicles. Calyx 5-lobed. Petals 5, 

 clawed. Stamens numerous, inserted on the flat or slightly concave receptacle; filaments 

 narrowed at the base. Pistils about 10 (5-15), distinct; ovary 2-ovuled. Ripe carpels capsu- 

 lar, indehiscent, i-seeded. Seed pendulous. [Named from the fancied resemblance of the 

 leaf-segments to those of Ulmus, the Elm.] 



About 9 species, natives of the north temperate zone. 



Lateral leaflets palmately 3~5-lobed; flowers pink or purple. i. If. rubra. 



Lateral leaflets merely serrate, or slightly lobed; flowers yellowish-white. 2. U. Ulmaria. 



