108 ORDER 44. ROSACES. 



HP. Pennsylvanica L. Erect, whitish-downy ; Ifts. 50, oblong, obtuse, pm- 

 natifid, upper ones larger ; cyme fastigiate, at length loose. 2f N. Eng. : rare. 



12 P. arguta Ph. Erect, grayish, pubescent and villous; radical Ivs. on long peti- 

 oles, 7-9-foliate, cauline few, 3-7-foliate ; Ifts. broadly ovate, cut-serrate, crowded ; fls. 

 in dense terminal cymes, li By streams, N. and W. 2 3f, stout. May, June. 



1 3 P. NEPALENSIS. Root Ivs. quinate ; stem ternate ; Ifts. wedge-oblong, serrate ; etip. 

 large, adnate, entire. 2f Nepal, l^f. Flowers large, rose, scarlet, orange, &c. 



14 P. ATROSANGUINEA. Lvs. ternate ; Ifts. obovate, cut-serrate, white-downy beneath; 

 scp. elliptic; pet. obcordate. y. Nepal. Iff. Flowers crimson, often double. 



14. ALCHEMILLA, L. LADIES' MANTLE. Calyx 4-toothed, with 4 

 external bractlets. Petals 0. Sta. 1 4. Carp. (1 4) mostly solitary, with 

 the style lateral. Stig. capitate. Seed suspended. Low herbs, with pal- 

 rnately lobed 01 incised leaves and small green flowers. Fig. 38. 



1 A. arvensis Scop. Parsley Piert. Lvs. crenate at base, incisely 3-lobed or parted, 



the segm. 2-3-cleft, pubescent ; fls. axillary. (T) E. Va. A small weed. Europe. 



2 A. alp I mis L. Lvs. radical, silky beneath, 5-7-parted, cut-serrate at apex ; fls. co- 



rymbed. High Mts. of N. Eng. (Pursh, 1816.) t Europe. 



15. POTERIUM, L. BURNET. Calyx tube contracted at the top. 

 Lobes 4, imbricated, petaloid, deciduous. Pet, 0. Sta. 4 GO , exserted. 

 Styles slender, 1 3. Stig. penicillate. Ach. included in the hardened, 4- 

 angled calyx tube, l Lvs. unequally pinnate, with long stalks and ad- 

 nate stipules. Lfts. petiolulate, serrate. Fls. in a spike or head, on a long 

 peduncle or scape, often <? . (Includes Sanguisorba L.) 



1 P. Canadense (L.) Glabrous ; Ifts. many, ovate or oval, obtuse, cordate, with 



serrate stipels and stipules ; spikes cylindric (30 ; stam. 4, long exserted. Wet 

 meadows along the mountains. Can. to Ga. 2 4f. Flowers green-white-. Aug. 



2 P. Sanguisorba L. Glabrous ; leaflets many, ovate or roundish, deeply serrate , 



heads snbglobous ; eta. GO, in the lower fls. L. Huron (Hooker) and W. Purp. t Aug. 



1 6. AGRIMONIA, L. AGRIMONY. Calyx tube turbinate, contracted 

 at the throat, muricate, limb 5-cleft, connivent in fruit. Pet. 5. Sta. 12 

 15. Ov. 2. Styles terminal. Ach. included in the indurated tube of the 

 calyx. U Lvs. pinnately divided. Fls. yellow, in long, slender racemes. 



1 A. Eiipatoria L. Lfts. 5 to 7, lance-oval or obovate, with email ones interposed, 



coarsely dentate ; stip. large, dentate ; pet, twice longer than the reflexed calyx. Dry 

 soils, common. 1 3f. Rac. spicate, 6' If. Fls. 3 4" broad. July, Aug. 



2 A. parviflora Ait. Lfts. 9 17, crowded, pubescent beneath, lanceolate, cut-serrate, 



with smaller ones interposed ; pet. small. Woods, &c., Pa. S. and W. Plant fragrant, 

 3 4f, with spreading brownish hairs. July, Aug. 

 0. inclsa. Lfts. incisely pinnatifid. South. (A. incisa T. & G.) 



17. ROSA, Tourn. ROSE. Calyx tube urceolate, contracted at the ori- 

 fice, lined with the fleshy disk. Petals 5 (greatly multiplied by cultiva- 

 tion). St. GO, inserted into the rim of the disk. Ach. GO, bony, hispid, 

 borne free within the calyx tube. ^ Prickly. Lvs. odd-pinnate. Stip. 

 mostly adnate to the petiole. Figs. 35, 139, 197, 301. 



Obs. Our innumerable varieties of garden Roses have mostly originated with the few species men- 

 tioned below. To define these varieties 'in order to their recognition would generally be impossible, for 

 their forms are as evanescent as their names are arbitrary. All that we propose is to aid the learner ia 

 tracing back each form to the ipecies whence it sprung. Thia will be easily done in all casei except with 

 th* hybrid*. 



