ROSACEAE (ROSE FAMILY) 1 29 



BB. Sepals acuminate; petals spatulate or oblanceolate; leaves canescent. E. 



P. cinerascens 

 6A. Leaves i-veined. C. E. P. caespltosum 



HOLODISCUS (Ocean Spray) 



Leaves deciduous; stipules none. Flowers in terminal panicles, many. 

 Sepals s, 3-veined. Petals white or pinkish. Stamens about 20. Akenes 

 long-hairy. — (Gk. holos — whole, diskos = a disk ; the disk of the re- 

 ceptacle is entire-margined.) 



A. Leaves acute to truncate at base. W. C. E. H. discolor 



AA. Leaves cuneate at base. U. C. H. glabrescens 



HORKELIA (Horkelia) 



Perennial, with scaly rootstocks or caudices. Leaves pinnately compound. 

 Flowers in cymes or panicles. Calyx segments 5. Petals 5, white or rose 

 or yellow. Stamens 5-20, in the throat of the calyx tube. Filaments 

 filiform or somewhat petal-like. Receptacle flat to conic. Pistils 3 to 

 many ; styles long. — (Meaning undetermined.) Species too difficult for 

 beginners. 



POTENTILLA (s-Finger) 



Leaves pinnately or digitately or ternately compound. Calyx segments 

 4-5. Petals 5, obcordate to round, yellow or white or dark purple. Stamens 

 usually 20, in 3 series of 10 -f s -|- 5 respectively, near the base of the calyx 

 cup ; style near apex of ovary, jointed to it, deciduous. — (Diminutive 

 of L. potens = powerful; first applied to Argentina anserina, which was 

 thought to be medicinal.) Species too difficult for beginners. 



ARGENTINA (Silverweed) 



Perennial, with long runners. Leaves interrupted-pinnate; leaflets 

 many. Flowers on long peduncles, in the axils of the basal leaves. Calyx 

 segments 5 or more. Petals elliptic to orbicular. Stamens 20-25, in 3 

 series, near base of calyx. Receptacle hemispheric. Pistils very many;, 

 style glabrous. — (L. argentina = of silver; from the silvery-hairy leaves.) 



A. Leaves silvery on both sides. W. C. E. A. argentea 



AA. Leaves silvery beneath, green above. 

 B. Stem and petiole and leaf rachis densely hairy. W. E. 



A. anserina (goose tansy) 

 BB. Stem and petiole and leaf rachis glabrous or slightly appressed-hairy. W. 



A. pacifica 



FRAGARIA (Strawberry) 



Perennial, acaulescent. Leaves ternate. Calyx segments 5. Petals 

 white, obovate to orbicular. Stamens about 20, in 3 series, sometimes 

 abortive, closely surrounding the base of the receptacle. Receptacle hemi- 

 spheric or obconic, enlarged and red in fruit, very juicy, edible. Akenes 



ir. & R. EL. FL. — 9 



