EOSACEAE (rose FAMILY) 263 



high, glabrate or more or lesa puberulent, especially above: leaves mostly 

 basal, interruptedly pinnate, spreading or suberect, dark green or tinged with 

 purple; leaflets ovate-cuneate or narrower, incisely toothed; stem leaves 

 pinnately incised: stems surpassing the leaves, rarely nearly twice as long, 

 1-3-flowered: calyx dark- or purplish-green; the triangular lobes scarcely 

 longer than the lanceolate bractlets, much surpassed by the obovate bright 

 yellow petals: style glabrous, not exserted in fruit; achene villous-hirsute. 

 Geum Bossii. — ^Alpine; in Colorado, Utah, and Wyoming. 



3. Sieversia scapoidea A. Nels. Glabrous (obscurely puberulent imder a 

 strong lens): leaves rosulate-spreading from the crowns of a. more or less 

 branched woody rootstock, interruptedly pinnate, 5-10 cm. long; leaflets ob- 

 ovate, 3-cleft into oblong, subacute lobes, not crowded: stems scapose," few, 

 erect, strictly l-flowered, 14-20 cm. high; the bract-like leaves entire, linear, 

 15-20 mm. long, the rather large stipiiles long-adnate: flowers large, 2 cm. 

 broad: calyx sOftly pubescent, its triangular-lanceolate lobes longer than its 

 tube; the bractlets minute, nearly linear: petals obovate-orbicular, pale yellow, 

 twice as long as the calyx: achene tapering gradually into the style,' long- 

 hirsute as is also the thickened base of the style. — ^Utah. 



27. AGRIMONIA L. Agmmont 



Tall perennial herbs, with interruptedly pinnate leaves, and flowers with 

 3-cleft bracts, in long slender spicate racemes. Calyx tijirbinate, surrounded 

 by a margin of hooked prickles. Petals yellow, small. . Stamens 5-12. Car- ; 

 pels 1-3, becoming achenes, inclosed in the dry and firm calyx-tube which is 

 constricted at the throat and its 5 lobes connivent. 



1. Agrimonia Brittoniana Bickn. Bull. Torr. Bot. Club 23: 517. 1896. 

 Stout, 4r-7 dm. high, virgately branched, hirsute: leaflets 7-11, with smaller 

 leaf-segments interposed, elliptic-oblong, acute, sharply serrate; stipules 

 lanceolate, acuminate: flbwers crowded: fruit 8 mm. long, refleied; the bris- 

 tles often purplish, inflexed. A. Eupatoria. — Colorado to Montana, east to 

 New York. , 



• 28. SANGUISORBA L. 



Amiual or perennial herbs, with alternate, pinnatifid, stipulate leaves and 

 small perfect flowers , in dense, terminal, peduncled spikes or heads. Calyx- 

 lobes 4J imbricated, deciduous, petalpid; calyx-tube l-angled, naked. Petals 

 wanting. Stamens 2-12, inserted on the throat of the calyx., Carpels usually 

 only 1, inclosed in the dry, 4- wing-angled calyx> — Poterivmi. 



1. Sanguisorba annua Nutt. T. & G. Fl. N. A. 1: 429. 1840. Glabrous,, 

 slender, ^4 dm. high: leaflets 4-6 pairs, ovate to oblong, with linear segments : 

 flowers greenish; the heads ovoid 6r oblong: stamenS 2-4: fruits shorter thah 

 the bracts. Potermm annuum. — Possibly withiii our range _; said to occur from 

 the upper Missouri to Oklahoma and in California to Washington. 



29. ROSA (Toum.) L.* Rose 



Shrubby more or less prickly plants, with pinnate leaves and large flowers 

 solitary at the ends of the branchlets or in few-flowered corymbs. Stipules 

 adnate to the petiole. Caljrx without bractlets. Stamens numerous on the 

 thick margin of the silky disk which nearly closes the throat of the calyx- 

 Carpels many, hairy, becoming bony achenes inclosed and concealed in the 

 globose or urn-shaped fleshy calyx-tube, which resembles a pome. 



* There are few genera in which the speoiea are so difficult of discrimination. The species 

 as given here are no doubt, in some cases ati least, *' group species, "but it does not seem 

 possible in the present state of our knowledge so to, characterize the different forms as to 

 malie! them distinguishable. 



