188 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Illustrations : Eng. Bot. 34 : pi. 2389; Fl. Dan. 9 : pi. 1875; Hort. Kew. 2 : pi. 

 9 ; Britt. & Brown, 111. Fl. 2 : /. 1933. Plate 100, f. 6; dissection of flower, /. 7; pistil, 

 /. 8; stamen, /. 9; fruiting hypanthium and calyx, /. 10. 



Caudex woody and creeping ; annual branches herbaceous, 1-2 dm. high, sparingly 

 appressed silky-strigose. Stipules lanceolate, foliaceous, entire, about 5 mm. long. Leaves 

 ternate, subcoriaceous, green and shining above, pale beneath ; leaflets obovate-cuneate, 

 three-toothed at the truncate apex. Cyme open, on a slender peduncle. Flowers about 

 1 cm. in diameter. Hypanthium appressed-strigose, in fruit about 5 mm. in diameter. 

 Bractlets oblong, acute, shorter than the ovate-lanceolate acute sepals. Petals white, 

 obovate or elliptic, about a half longer than the sepals or more. 



A native of northeastern America, ranging from Greenland to New Jersey and 

 Manitoba and in the AUeghanies extending as far south as northern Georgia; also 

 occurs in the mountains of Scotland. 



II. DASIPHORA Raf 



Potentilla L. Sp. PI. 495. In part. 1753. 



Dasiphora Raf Aut. Bot. 167. 1838. 



Comocarpa Torr. & Gr. Fl. N. Am. 1: 445. As subgenus under Potentilla. 1840. 



Rydb. Mem. Dept. Bot. Col. Univ. 2 : 6. 1898. 



Hypanthium saucer-shaped. Bractlets, sepals and petals 5. Petals in ours yellow, 

 nearly orbicular, neither unguiculate nor emarginate. Stamens about 25, in 5 festoons 

 on a pentagonal disk surrounding the receptacular column ; filaments filiform ; anthers ob- 

 long, flat, not didymous, dehiscent by a longitudinal slit along the margin. Receptacle 

 hemispheric, with numerous pistils ; style club-shaped, thick and glandular upward, in- 

 serted near or below the middle of the ovary ; stigma large and evidently four-lobed ; 

 achene densely covered with long straight hairs. Seed ascending and amphitropous. 



The genus comprises 8 or 9 shrubs with scarious sheathing stipules and pinnate 

 leaves, the leaflets in ours with, entire margins ; they are all Asiatic, but the following 

 species is also native of North America and parts of Europe. 



I. Dasiphora fruticosa (L.). 



Potentilla fruticosa L. Sp. PI. 495. 1753. 



L. Sp. PL Ed. 2, 709; Mill. Gard. Diet. Ed. 8, No. 3; Dietr. Pflanz. Ed. 2, 89; 

 Ait. Hort. Kew. 2: 212; Ed. 2, 3 : 273 ; Willd. Sp. PL 2: 1094; Poir. in Lam. Enc. 

 Meth. 5 : 584 ; Persoon, Syn. PL 2 : 53 ; Nestler, J\Ion. Pot. 23 and 30 ; Lehm. Mon. 



