100 ROSACES. 



or pinnateiy incised ; stipules lanceolate, somewhat laciniate ; flowers in 

 corymbose panicles ; segments of the calyx somewhat acute, as long or a 

 little longer than the corolla ; petals obcordate. P. arguta Lehm. not of 

 Pursh. 



N. S. ? Can. and throughout British America. W. to the Rocky Mountains. 

 June. 1\.. Stem 1 2 feet high. Flowers pale yellow. According to Torrey 

 and Gray this species is not found within the limits of the U. S. east of the Mis- 

 sissippi. They represent it as being very variable. Northern Cinquefoil. 



10. P. arguta Pursh. : erect, simple, pubescent ; leaves unequally pin- 

 nate ; leafets roundish, ovate or somewhat rhomboid, incised or doubly ser- 

 rate, outer ones larger ; stipules rhomboidal, toothed or entire ; flowers ter- 

 minal, in a crowded corymb. P. conflertijlora Lehm. Geum agrimonoides 

 Pursh. Bootia sylvestris Big. 



Banks of streams. Can. to Penn. W. to the Rocky Mountains. June, July. 

 1\.. Stem 1 3 feet high, erect, nearly simple, branched above and with the 

 petioles peduncles and calyx covered with a brownish and glandular pubes- 

 cence. Flowers erect, at first in dense corymbs, at length paniculate. Calyx 

 with the five alternate segments smaller. Petals ochroleucous or white. 



Close-floviered Cinquefoil. 



11. P. Comarum D.C.: root creeping ; stem ascending; leaves pinnate, 

 upper ones ternate ; leafets lanceolate, acutely serrate ; petals lanceolate, 

 acuminate, much shorter than the calyx. P. palustris Lehm. Comarum 

 palustre Linn. Torr. <f Gr. 



In swamps. N. S. N. to Arct. Amer. June, July. 1J-. Stem 18 inches high, 

 nearly simple. Leaves petioled, with 5 6 leafets. Flowers large, purple, on the 

 upper part of the stem. Marsh Cinquefoil. 



10. SIBBALDIA. Linn. Sibbaldia. 



(In honor of Robert Sibbald ; a writer upon the natural history of Scotland, 

 of the 17th century.) 



Calyx 10-cleft, with the alternate segments narrower. Petals 

 5, minute. Stamens and carpels often 5. Styles 5, proceeding 

 laterally from the germ. Capsules 5, indehiscent, in the bottom 

 of the calyx, 1 -seeded. 



(S. procumbens Linn. : leaves ternate ; leafets cuneate, tridentate, smooth 

 above, hairy beneath ; flowers corymbed; petals lanceolate, acute, shorter 

 than the calyx. 



High mountains. Can. and Ver. Pursh. Labrador and the summits of the 

 Rocky Mountains. July. 17 . A small procumbent plant, with the habit of Po- 

 tentilla tridentata. Petals yellow, sometimes wanting. Stamens 5 7. Pistils 

 510. Procumbent Sibbaldia. 



11. AGRIMONIA. Linn. 



(.Corrupted from Argemone, a name given by the Greeks to a plant supposed to 

 cure cataract, called apyr^a.) 



Calyx turbinate, covered with hooked bristles, 5-cleft, infe- 

 rior, with 2 bracteoles at the base. Petals 5. Stamens 12 15, 

 inserted with the petals upon the calyx. Achenia 1 2, in- 

 vested by the hardened calyx. 



