222 ROSACEAE. (Vou. II. 
14. DRYAS L. Spy ble SOU. a 754s 
Low tufted herbaceous shrubs, with simple petioled stipulate leaves white-canescent be- 
neath, and white or yellow, rather large perfect solitary flowers on slender scapes. Calyx 
persistent, not bracted, its tube concave, glandular-hirsute, 8-g-lobed. Petals 8 or 9, obovate, 
larger than the calyx-lobes. Stamens ™, inserted on the throat of the calyx; filaments subu- 
late. Carpels ~, sessile, inserted on the dry receptacle; style terminal, persistent, elongated 
and plumose in fruit. Seed ascending, its testa membranous. [Name Latin, a wood- 
nymph. | 
Three species, natives of the cold-temperate and arctic parts of the north temperate zone. 
Flowers white; sepals linear. 
Leaves oval or ovate, coarsely crenate. D. octopetala. 
zr 
Leaves ovate, or ovate-lanceolate, subcordate, entire or nearly so. 2. D. integrifolia. 
Flowers yellow; sepals ovate; leaves crenate. 3. D. Drummondit. 
1. Dryas octopétala IL. White Mountain Avens. (Fig. 1949.) 
Dryas octopetala I,. Sp. Pl. 501. 1753. 
Dryas chamaedrifolia Pers. Syn.2: 57. 1807. 
Stems prostrate, woody at the base, 
branched, 3/-6’ long. Stipules linear, ad- 
nate to the petiole; leaves oval or ovate, 
coarsely crenate all around, green and gla- 
brous above, densely white-canescent be- 
neath, generally obtuse at each end, %4/-1’ 
long; scape terminal, erect, 1/-5’ long, 
pubescent; flower white, about 1’ broad; 
sepals linear, acute or acutish, glandular- 
pubescent, persistent; style about 1’ long, 
plumose and conspicuous in fruit. 
Labrabor and Greenland and throughout 
arctic America, south in the Rocky Mountains 
to Utah. Also in arctic and alpine Europe 
and Asia. June-Aug. 
2. Dryas integrifolia Vahl. Entire-leaved 
Mountain Avens. (Fig. 1950.) 
Dryas integrifolia Vahl, Act. Havn. 4: Part 2, 171. 1798. 
Dryas tenella Pursh, Fl. Am. Sept. 350. 1814. 
Similar to the preceding species, but the leaves are i. Ne. 
ovate or oyate-lanceolate, obtuse and often subcordate at ak \' V Ni a 
the base, obtusish at the apex, entire or with I or 2 teeth c 
near the base, the margins strongly revolute; flowers 
white, generally slightly smaller; sepals linear. 
“White Hills of New Hampshire,’’ collected by Prof. 
Peck, according to Pursh; Anticosti, Labrador, west through 
arctic America to Alaska, and in Greenland. June—Aug. 
