ROSACEAE. 207 



numerous, sessile on the dry receptacle; style terminal, persistent, 

 elongated and plumose in fruit. 



Dryas octopetala L. Somewhat shrubby, densely matted; leaves oblong- 

 ovate, obtuse, crenate, bright green above, white beneath; flowers white. 

 At high altitudes on Mount Rainier and northward. 



278. GEUM. 



Perennial herbs; leaves pinnate, with stipules, the radical clus- 

 tered; cauline smaller; flowers rather large, solitary or in corymbs; 

 calyx 5-lobed with 5 alternate bractlets; petals 5, obovate, 

 usually longer than the calyx-lobes; stamens many, on the throat 

 of the calyx; styles terminal, elongated in fruit, usually plumose 

 or jointed, the upper part deciduous; akenes 2-6, pubescent. 



Receptacle downy; terminal leaflet cuneate-obovate to ob- 



lanceolate, deeply cleft into acute lobes. G. strictum. 



Receptacle nearly naked. 



Terminal leaflet broadly ovate to suborbicular, not cor- 

 date, crenately cleft into mostly obtuse lobes. G. oregonense. 

 Terminal leaflet suborbicular, cordate, finely crenate- 



dentate. G. macrophylhim. 



Geum strictum Ait. Stems 60-120 cm. high, hirsute; radical leaves pinnate; 

 cauline 3-5-foliolate; leaflets cuneate-obovate, incisely and acutely lobed and 

 toothed, pubescent; petioles hirsute; flowers rather large; petals golden yellow; 

 receptacle densely pubescent; styles hairy at top, the lower portion not glan- 

 dular. 



Victoria, British Columbia, common, Macoun. Not elsewhere reported 

 from west of the Cascade Mountains. 



Geum oregonense Scheutz. Intermediate between G. strictum and G. 

 macrophylhim; leaflets obtuse, the terminal one broadly ovate or suborbicular, 

 cuneate or truncate at base, deeply lobed and toothed; inflorescence open; 

 receptacle glabrous; petals pale yellow; styles puberulent. 



Reported from Vancouver Island, Macoun. 



Geum macrophyllum Willd. Stout, erect, 30-80 cm. high, bristly-hairy; 

 radical leaves pinnate, the terminal leaflet much larger than the 3-8 lateral 

 ones, broadly ovate or suborbicular, 3-7-lobed, dentate, 5-10 cm. long; lateral 

 leaflets ovate or elliptic, dentate, 2-3 cm. long, usually with smaller ones inter- 

 spersed; cauline leaves similar, but nearly sessile, with 1-3 leaflets or segments; 

 stipules ovate, toothed, 1-2 cm. long; flowers yellow, about 1 cm. broad, 

 several in a loose cyme; petals obovate, deep yellow, longer than the reflexed 

 acute calyx-lobes; fruiting head globose, 1.5 cm. long; akenes hispid; styles 

 jointed and twisted near the tip, the lower portion glandular. 



In fields and meadows. 



279. SIEVERSIA. 



Low perennial herbs with simple stems; radical leaves pinnate; 

 flowers in terminal cymes; sepals 5, erect or spreading, with 5 

 bractlets; petals 5; carpels sessile; styles not jointed, persistent, 

 erect, plumose or naked. 



Petals shorter than the sepals. S. ciliata. 



Petals longer than the sepals. S. campanulata. 



