ROSACEAE (rose FAMILY) 253 



1. Chamaerhodos erecta (L.) Bunge, in Ledeb. Fl. Alt. 1: 430. 1829. 

 Stem slender, paniculately branched above, 1-3 dm. high: radical leaves 

 rosulate, ternately or bitemately many cleft: sepals lanceolate, nearljr equal- 

 ing the short white obovate-ouneate petals. — From Canada to Wyoming and 

 northwestward. 



20, DRYMOCALLIS Fourr. 



Pereimial, usually glandular- viscid herbs, with pinnate leaves and in;eg- 

 ularly cymose flowers. Sepals 5, with 5 alternating bractlets. Petals 6, 

 white or yellow. Stamens SO-30, in five fascicles on the thickened margin of 

 a disk around the receptacle. Receptacle hemispheric, bearing the numerous 

 pistils. Style inserted near the base of the ovary, thickened and glandular a 

 little below the middle and tapering to both ends; the stigma minute. — Po- 

 tentiUa in part. , ... 



Petals white, oftea turning yellowish in drying. 

 Petals and sepals subequal. 



Inflorescence crowded; leaves densely pubescent . . . 1. D. arguta. 



Inflorescence open; leaves glabrate . , , . . 2. D. convallaria. 



Petals distinctly longer than the sepals 3. D. pseudorupestris. 



Petals evidently yellow. 



Petals and sepals subequal 4. D. glandulosa. 



Petals distinctly longer than the sepals. 



Inflorescence crowded; the plant glandular-hirsute , . 6. D. fissa. 



Inflorescence open; the plant viscid-glandular , , _, 6, ,D, glutinosa. 



1. Drymocallis arguta (Pursh) Rydb. Mem. Dept. Bot. Columbia Univ. 

 2: 192. 1898. Erect, stout, glandular and villous pubescent, 3-7 dm. high: 

 leaflets of basal leaves 7-11, ovate or rhomboid-ovate; the terminal one 

 cuneate, the others rounded at base and somewhat obUque; all incisely ser- 

 rate: stem leaves with few leaflets and often subsessile: flowers white, densely 

 cymose: petals obovate, scarcely longer than the acute sepals. Poienii7ta 

 arguta Pursh. — ^From Colorado eastward to the New England States. 



2. Drymocallis convallaria Rydb. 1. c. 193. Sparsely loiig-villous, viscid- 

 glandular above, 4-8 cm. high, somewhat branched above: basal leaves with 

 9-ll glabrate or somewhat piibescent obovate obtuse incisely serrate leaflets, 

 on long petioles, villous at base; the stem leaves smaller, with subacute leaf- 

 lets: c3Tne branched; the flowers on short pedicels: calyx villous, glandular- 

 viscid; petals obovate, white, dnfing yellowish, scaftxjely longer than the sepals 

 which are much longer than the bractlets. Potentilla glandulosa Lindl. in 

 part. — ^From Wyoming to WashiilgtOh. ' '.,.■: 



3. Drymocallis pseudorupestris Rydb. 1. c. 194. Sparingly gland'ular- 

 villous, the slender striate stems with ascending branchlets above, 2^ dm. 

 high: basal leaves short-petioled, with 7-9 sparsely pubescent or glabrate 

 leaflets; the terminal one obovate or cuneate-flabellifomi; the- lateral ones 

 obliquely elliptic or suborbioular; all incisely serrate, , with ovate mucronu- 

 late teeth; stem leaves few, with 3t5 leaflets: inflorescence open, the flowers 

 on slender pedicels: calyx viscid- villous,^ scaircely enlarged in fruit : petals ob- 

 ovate, white, drying yellowish, exceeding the sepa,ls by a third: bractlets 

 much smaller than the sepals. — ^Through northern Wyoming to Washington^ 



■ 4. Drymocallis glandulosa (Lindl.) Rydb. 1. c. 198. Viscid and glandular- 

 Ijairy, especially^ upward, the stem simple below, irregularly branched above: 

 basal leaves petioled, pinnate or interruptedly pinnate; leaflets 7-9, sparingly 

 hairy or glabrate above, obovate, obtuse, 1-3 cm. long, with broad teeth: cyme 

 open, many-flowered: calyx glandular-hirsute/ bractlets almost linear, much 

 shorter than the sepals: petals yellow, obovate, not longer than the sepals, 

 which in fruit are 8-10 mm. long. Potentilla glandidosa Liadl. in part. — Da- 

 kota to New Mexico, west to California. 



5. Drymocallis fissa Nutt. Rydb. 1. c. 197. Glandular-hirsute throughout, 

 rather freely branched, 2-3 dm. high: basal leaves short-petioled, with about 

 9 suborbicular, subrhombic, and incisely doubly serrate leaflets; stem leaves 

 similar but reduced: flowers yellow, large, 2 cm. in diameter, in a narrow 



