1 38 ROSACEAE. 



195. SANGUISORBA. 



Annual or perennial herbs; leaves alternate, odd-pinnate; 

 stipules adherent to the petiole; flowers small, perfect (in ours), 

 in dense terminal spikes or heads; calyx 4-lobed; petals none; 

 stamens 4-many; styles terminal, filiform; carpels 1-3, free from 

 the calyx-tube; akenes usually 1, enclosed in the 4-angled dry 

 closed calyx-tube. 



Annual; flowers greenish. S. annua. 



Perennial ; flowers white or reddish. 5. lalifolia. 



Sanguisorba annua Nutt. Annual, erect, glabrous, 15-40 cm. high, usually 

 simple below; leaflets 4-6 pairs, 1-2 cm. long, ovate or oblong, deeply pinnatifid 

 into linear obtusish lobes; flowers perfect, greenish, in short oblong spikes, 1-3 

 cm. long; bracts ovate, scarioub-margined, persistent; calyx-lobes broadly 

 ovate, scarious; stamens 4, rarely 2, somewhat exserted. Dry ground, common. 



Sanguisorba latifob'a (Hook.) Coville. Perennial, glabrous; stems 30-90 

 cm. high, simple or branched above; leaflets 5-10 pairs, oval, about three times 

 as long as broad, coarsely serrate, more or less cordate; stipules serrate; spikes 

 3-10 cm. long; flowers white. In bogs in the Blue Mountains. 



196. GEUM. 



Perennial herbs; leaves pinnate, with stipules; 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 



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



Receptacle nearly naked. 



Terminal leaflet broadly ovate to suborbicular, not 



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

 Terminal leaflet suborbicular, cordate, finely crenate- 



dentate. G. macrophyllum. 



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. Moist meadows, rare in 

 our limits. 



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

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

 cuneate or truncate at base, more deeply lobed and toothed; receptacle gla- 

 brous; styles puberulent. In moist meadows. 



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; 



