Vou. II.]J ROSE FAMILY. 223 
3. Dryas Drummondii Richards. 
Drummond’s Mountain Avens. 
(Fig. 1951.) 
Dryas Drummondii Richards.; Hook. Bot. Mag. //. 
2972. 1830. 
Dryas octopetala var. Drummondii §. Wats. Bibliog. 
Index, 1: 281. 1878. 
Similar to D. octopetala, the leaves crenate-den- 
tate, but generally narrowed at the base. Scape 
floccose-pubescent, often taller; flower yellow, 
about 9’ broad; sepals ovate, acutish, black glan- 
dular-pubescent. 
On gravel, Gaspé, Quebec; Anticosti and Labrador, 
throughout arctic America, and in the Canadian Rocky 
Mountains. June-Aug. 
ae CERCOCARPUS H.B.K. Nov. Gen. et Syoy, ig ews v7 tise. 
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. 
1. Cercocarpus parvifolius H. & A. 
Small-leaved Cercocarpus. (Fig. 1952.) 
Cercocarpus parvifolius H. & A. Bot. Beechey Voy. 
337- 184r. 
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’/-12’’ 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, 1-seeded. Seed pendulous. [Named from the fancied resemblance of the 
leaf-segments to those of U/mus, the Elm. ] 
About g species, natives of the north temperate zone. 
Lateral leaflets palmately 3-5-lobed; flowers pink or purple. 1. U. rubra. 
Lateral leaflets merely serrate, or slightly lobed; flowers yellowish-white. 2. U. Ulmaria, 
