ROSE FAMILY 447 



2. Adenostoma sparsifolium Torr. Yerba del Pasmo, Ribbon Wood. Fig. 2470. 



Adenostoma sparsifolium Torr. in Emory, Notes Mil. Rec. 140. 1848. 



An arborescent, yellowish-green and resinously glandular shrub, 2-6 m. high, with reddish- 

 brown trunks, old bark exfoliating. Leaves narrowly linear, alternate, not fascicled, 7-15 mm. 

 long, glandular ; flowers in open showy panicles ; sepals rounded, whitish, 2 mm. long, half the 

 length of the white elliptic petals ; stamens shorter than the petals. 



Chaparral, Upper Sonoran Zone; rare in the Santa Monica Mountains, common in the San Jacinto Moun- 

 tains, California, extending southward to northern Lower California. Type locality: Warner's Pass, San Diego 

 County, California. July-Nov. Thin-leaved Chamise. 



21. DRYAS L. Sp. PI. 501. 1753. 



Low depressed cespitose shrubs with short spreading branches. Leaves alternate, 

 petioled, simple, toothed or entire. Flowers solitary on naked peduncles. Sepals 8-10, per- 

 sistent, nearly distinct. Petals 8-10. Stamens numerous, inserted in the mouth of the 

 little developed saucer-shaped hypanthium. Pistils numerous, sessile ; style terminal, per- 

 sistent, elongated and plumose in fruit. Fruit 1-seeded, indehiscent; seed basal, ascending. 

 [Name, Latin, a wood-nymph.] 



Three species, natives of the arctic and cold temperate regions of the north temperate zone. Type species, 

 Dryas octopetala L. 



1. Dryas Drummondii Richards. Drummond's Mountain Avens. Fig. 2471. 



Dryas Drummondii Richards, in Hook. Bot. Mag. 57: pi. 2972. 1830. 

 Dryas octopetala var. Drummondii S. Wats. Bibl. Index 1: 281. 1878. 

 Dryades Drummondii Kuntze, Rev. Gen. PI. 215. 1891. 



Stems prostrate, cespitose, young branches white-tomentose. Leaves elliptical or obovate, 

 1-3 cm. long, densely white-tomentose beneath, dark green and glabrous or nearly so above, firm, 

 veiny and somewhat rugose, coarsely crenate-serrate, the margins of the teeth slightly revolute ; 

 petioles 1-3 cm. long ; scape 5-20 cm. long, white-tomentose and with a few scattered black hairs 

 above ; hypanthium densely covered with black glandular hairs ; petals yellow, oblong-spatulate, 

 about 1 cm. long, almost erect ; fruiting styles 3-4 cm. long. 



Rocky slopes and ledges, Arctic-Alpine Zone; Alaska, Mackenzie River, and Quebec to the Blue Mountains, 

 Oregon, and Montana. Type locality: Canadian Rocky Mountains. June-Aug. 



22. GEUM L. Sp. PI. 500. 1753. 



Perennial herbs with rootstocks and odd-pinnate or pinnatifid, stipulate leaves with 

 large terminal lobes. Flowers cymose or solitary, yellow, white or purple. Hypanthium 

 persistent, turbinate or hemispherical, usually 5-bracteate. Sepals 5. Petals 5, orbicular 

 to cuneate, obtuse or emarginate. Stamens numerous, inserted on a disk at the base of the 

 hypanthium; filaments filiform. Pistils numerous, on a short clavate receptacle ;_ styles 

 terminal, filiform, strongly curved and geniculate above, the upper portion deciduous. 

 Achenes small with a hooked beak. Seed erect, with a membranous coat. [The ancient 

 Latin name.] 



About 40 species, most abundant in the north temperate zone, a few in southern South America, one in 

 South Africa. Type species, Geum urbanum L. 



Lower portion of style glandular-puberulent. !• G. maerophyllum. 



Lower portion of style not glandular. 2 - G - strictum. 



1. Geum maerophyllum Willd. Large-leaved Avens. Fig. 2472. 



Geum maerophyllum Willd. Enum. Hort. Ber. 557. 1809. 



Geum urbanum var. oregonense Scheutz, Nova Acta Soc. Sci. Upsal. III. 7 6 : 26. 1870. 



Geum oregonense Rydb. Bull. Torrey Club 25: 56. 1898. 



Stems stout, erect, bristly pubescent. 3-10 dm. high. Stipules broad, foliaceous ; basal leaves 

 petioled lyrate-pinnate, the terminal leaflet much the largest, 6-10 cm. broad, reniform, orbicular 

 or cordate, crenulate-dentate, 3-7-lobed ; lateral leaflets 3-6, oval or obovate, with smaller ones 

 interspersed; stem leaves short-petioled or sessile, the divisions 2-4, rhombic to oblanceolate ; 

 flowers corymbiform; bractlets linear, minute; sepals 3-5 mm. long; petals yellow, 4-8 mm. long; 

 receptacle short-pubescent ; lower internode of style glandular-puberulent. 



Wet meadows, Boreal and Transition Zones; Alaska to Newfoundland, south to southern California, Mon- 

 tana, and New Hampshire; also eastern Siberia. Type locality: Kamchatka. May-Aug. 



2. Geum strictum Ait. Yellow Avens. Fig. 2473. 



Geum strictum Ait. Hort. Kew. 2: 217. 1789. 



Stems erect or ascending, hirsute, 5-15 dm. high. Basal leaves lyrate-pinnate, pubescent or 

 glabrate- terminal leaflet broadly obovate or cuneate, variously cleft or divided and doubly 

 dentate, 2-10 cm. broad ; principal lateral leaflets 4-8, cuneate or obovate ; upper stem leaves 

 3-foliolate, short-petioled; flowers few on ascending pedicels; bractlets linear; sepals 6 mm. long; 

 petals yellow, 5-8 mm. long, receptacle densely short-pubescent ; lower internode of style 4-5 mm. 

 long, glabrous throughout, or sparingly hispid at the base, the upper internode hirsute. 



Wet meadows or swamps. Boreal Zones; British Columbia to Newfoundland, south to New Mexico, Mis- 

 souri, and New Jersey. Not definitely known from the Pacific States but common on Vancouver Island, lype 

 locality: North America. June-Aug. 



