252 ROSACEAE (ROSE FAMILY) 



flowers upon short erect scapes. Leaflets obovate-cuneate, coarsely toothed. 

 Calyx deeply 5-lobed and 5 bracteolate. Petals 5. Stamens numerous. 

 Carpels many, in fruit on a large fleshy scarlet receptacle; styles lateral. 



Leaves not glaucous; pubescence of scapes and petioles spreading or re- 

 flexed. 



Leaflets subsessile; achenes superficial . . . . . . 1. F. americana. 



Leaflets petiolate; achenes in deep pits . . . T . . 2. F. platypetala. 

 Leaves somewhat glaucous; pubescence of scapes and petioles appressed. 



Leaflets moderately thick, obovate; scapes several-flowered . . 3. F. ovalis. 



Leaflets thin, oblong-cuneate; scapes few-flowered . . . . 4. F. pauciflora. 



1. Fragaria americana (Porter) Brit. Bull. Torr. Bot. Club 19: 222. 

 1892. Rootstock short: leaves thin, soon glabrate on both sides; petioles 

 slender, 5-10 cm. long, sparingly silky with spreading hairs, often becoming 

 nearly glabrous; leaflets 3-8 cm. long, rhombic-obovate, mostly acute, in- 

 cisely and deeply serrate: runners very slender and long: scape 8-15 cm. 

 long, seldom much longer than the petioles, sometimes leaf y-bracteate : fruit 

 ovoid, 8-15 mm. long, red, achenes superficial. F. vesca in part. (F. brac- 

 teata Heller, Bull. Torr. Bot. Club 25: 194. 1898.) Throughout our range 

 and eastward. 



2. Fragaria platypetala Rydb. Mem. Dept. Bot. Columbia Univ. 2: 177. 

 1898. Rootstock very thick and woody: leaves glabrous and glaucous above, 

 appressed-silky beneath; petioles 2-20 cm. long, silky- villous with long 

 spreading or reflexed hairs; leaflets broadly cuneate or obovate, 2-8 cm. long, 

 coarsely serrate or crenate above the middle, more or less petiolate: runners 

 rather thick: scape 8-15 cm. high, rarely exceeding the leaves, several-flowered, 

 often leaf y-bracteate: flowers large, 15-25 mm. in diameter: sepals and bract- 

 lets lanceolate: petals suborbicular, about twice as long as the sepals: fruit 

 hemispherical; the achenes in rather shallow pits. F. virginiana in part. 

 Utah and Wyoming and northwestward. 



1 3. Fragaria ovalis (Lehm.) Rydb. Bull. Torr. Bot. Club 33: 143. 1906. 

 Rootstock short, moderately thick: leaves firm and rather thick, somewhat 

 glaucous, almost glabrous above, appressed-pubescent beneath; petioles and 

 scapes subequal, from densely appressed-pubescent to almost glabrate; 

 leaflets broadly obovate, 3-5 cm. long, evidently petiolate, coarsely toothed, 

 the lateral ones very oblique at base: runners slender, nearly glabrous: sepals 

 and bractlets oblong-lanceolate, acute: petals obovate, one half longer than 

 the sepals: achenes in shallow pits. (F. prolifica Baker and Rydb. Mem. 

 Dept. Bot. Columbia Univ. 2: 181. 1898; -F. pumila Rydb. 1. c.; F. firma Rydb. 

 1. c. 184.) From Canada to New Mexico and Nevada. 



3a. Fragaria ovalis glauca (Wats.) A. Nels. Leaves thin, less pubescent 

 as are also the petioles and scapes. [F. glauca (Wats.) Rydb. 1. c. 183.] 

 The commoner form in our range. 



4. Fragaria pauciflora Rydb. Mem. Dept. Bot. Columbia Univ. 2: 183. 

 1898. Rootstock slender: leaves thin and glaucous, almost glabrate above, 

 soon glabrate beneath; petioles and scapes more or less appressed-silky; 

 leaflets cuneate, subsessile, coarsely toothed above the middle, scarcely ob- 

 lique at base: scape 2-4-flowered, seldom exceeding the leaves: flowers 10-15 

 mm. in diameter: bractlets and sepals lanceolate: petals obovate: achenes set 

 in deep pits. F. vesca Wats, in part. Same range as the preceding. 



19. CHAMAERHODOS Bunge 



Small erect and branching glandular-pubescent herbs, with leaves many 

 cleft into linear segments and a dichotomously cymose inflorescence. Calyx 

 campanulate, deeply 5-cleft, the base lined with a membranous disk which is 

 densely bearded at the margin. Stamens 5, opposite the white petals, in- 

 serted with them in the sinuses of the calyx above the disk; filaments short. 

 Pistils 5-10, on a dry villous receptacle; subulate styles inserted near the base 

 of the ovary. 



