206 ROSACEAE. 



275. ALCHEMILLA. 



Low annual or perennial herbs; leaves palmately lobed or 

 compound, with sheathing stipules; flowers perfect, small, green- 

 ish , in corymbs ; calyx 4- or 5-lobed , with as many minute bractlets ; 

 petals none; stamens 1-4, very small; styles basal or lateral; 

 carpels 1-4, distinct, free from the calyx- tube; akenes 1-4, en- 

 closed in the calyx-tube. 



Alchemilla occidentalis Nutt. Annual, 2-8 cm. high, simple or branched 

 below, sparsely hairy; leaves short-petioled, fan-shaped, 3-parted, the lobes 

 acutely 2-3-cleft; stipules conspicuous, cleft; calyx 1-1.5 mm. long, acutely 

 4-cleft, the bractlets minute; akenes ovoid, pale, 1 mm. long. 



In dry fields, very inconspicuous. 



276. 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. 5. occidenlale. 

 Perennial; flowers not greenish. 



Flowers white. 5. latifolia. 



Flowers purple. 5. microcephala. 



Sanguisorba occidentale 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, scarious-margined, persistent; 

 calyx-lobes broadly ovate, scarious; stamens 4, rarely 2, somewhat exserted. 



In open prairies; scarcely separable from 5. annua Nutt. 



Sanguisorba latifolia (Hook.) Coville. (S. sitchensis C. A. Mey.) Per- 

 ennial, 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. 



Wet places in the mountains, rare southward; Alaska to Oregon and Idaho. 



Sanguisorba microcephala Presl. Glabrous; stems erect, 20-60 cm. high, 

 sparingly branched above, not much longer than the leaves; leaflets 9-13, 

 oblong-ovate, cordate, coarsely serrate-dentate, 1—4 cm. long, firm, paler be- 

 neath; spikes dark purple, dense, oblong, 1.5—2.5 cm. long; sepals oval; 

 stamens short, not much exserted. 



In bogs near the ocean coast, Alaska to northern California. 



277. DRYAS. 



Low tufted shrubs; leaves simple, petioled, white-canescent 

 beneath; stipules present; flowers rather large, perfect, solitary 

 on slender scapes; calyx persistent, not bracted, glandular- 

 hirsute, 8-9-lobed; petals 8 or 9, obovate, larger than the calyx- 

 lobes; stamens numerous, on the throat of the calyx; carpels 



