216 Rosaceae 

FRAGARIA STRAWBERRY 
Herbs, perennial, acaulescent; rhizomes scaly; runners prostrate, long, thin, root-_ 
ing from the joints. Leaves ternate (ours), basal. Calyx-cup almost flat; segments 5. __ 
Petals white or reddish, broadly obovate to orbicular, obtuse. Stamens about 20, in 3 
series, sometimes abortive, closely surrounding the base of the receptacle. Receptacle 
hemispheric or obconic, enlarged and red in fruit, very juicy, edible. Akenes very many; ~ 
style lateral. (L. fragans—fragrant; from the odor of the fruit. ) 
A. Pubescence of the scapes and petioles spreading, generally at right angles or some- 
what reflexed. : 
B. Leaves densely silky beneath, also somewhat tomentulose beneath; akenes in 
shallow pits. 
C. Leaves strongly veined beneath; terminal leaflet plainly petiolulate; sepals 
acute or mucronate; often cultivated. W. 
F. chiloensis Duch. 
CC. Leaves not strongly veined beneath; leaflets all subsessile; sepals acuminate. 
W.C. E. (F. crinita.) F, cuneifolia Nutt. 
BB. Leaves slightly silky beneath, glabrate when old. 
D. Leaflets subsessile; akenes not in pits, superficial W.C. E. (F. helleri; 
partly F. californica for our region; F. bracteata.) 
F. americana Brit. 
DD. Leaflets petiolulate; akenes in pits. 
E. Plant more or less glaucous; petals oval or orbicular, twice as long as the 
sepals. 
F. Sepals and bractlets elliptic. E. 
F. truncata Rydb. 
FF. Sepals and bractlets lanceolate. E. (F. suksdorfii; partly F. californica 
for our region.) FF, platypetala Rydb.  - 
EE. Plant not glaucous; petals roundish-obovate, 1!4 times as long as the 
sepals. W. F. grandiflora Erhr. 
AA.  Pubescence of the scapes and petioles appressed or ascending; akenes in pits. 
G. Flowers 2—3.5 cm. wide; leaves finely tomentulose beneath, strongly veined be- 
neath. (See C.) 
GG. Flowers 1—2 cm. wide; leaves not tomentulose beneath, not strongly veined 
beneath. E. (F. glauca; F. pauciflora.) 
F. ovalis Rydb. 
SIBBALDIA 
Herbs somewhat shrubby at base, less than | dm. high (ours), perennial, low, 
tufted. Leaves 3-foliolate; stipules present. Calyx-tube saucer-shaped or cup-shaped, 
small; segments 5. Petals yellow, obovate or cuneate or oblanceolate (ours), hardly 
equaling the sepals. Stamens 5, on the calyx. Receptacle small.  Pistils 5—20; styles 
lateral W.C.E. (Honor of R. Sibbald, a Scotch botanist. ) 
S. procumbens L. 
DASIPHORA SHRUB 5-FINGER 
Shrubs. Leaves pinnate, leathery; stipules sheathing, scarious; leaflets entire (ours). 
Flowers axillary. Calyx saucer-shaped; segments 5. Petals yellow (ours), nearly 
orbicular, not clawed, not emarginate. Stamens about 25, in 5 groups. Receptacle 
hemispheric. Pistils many; style at or below the middle of the ovary. Akenes densely 

