ORDER XLIV. ROSACEA. 303 



1. P. Norve'gica, (L.) Stem erect, hirsute, dichotomously divided. 

 Leaves palmate ; leaflets 3, obovate-oblong, upper ones lanceolate, 

 coarsely serrate. Flowers in leafy cymes ; segments of the calyx longer 

 than the petals. Petals obovate, emarginate. Carpels rugose, ribbed, 

 or striate. — Yellow. %. July — Aug. Common. 8 — 18 inches. 



Cinquefoil. 



2. P. Canaoen'sis, (L.) Stems pubescent, sarmentose, procumbent. 

 Leaves palmate ; leaflets 5, obovate, cuneiform, silky when young, in- 

 cisely toothed. Flowers on elongated, axiilary pedicels; segments of 

 the calyx ovate, lanceolate. Petals obcordate. Carpels somewhat ru- 

 gose. — Yellow. If. April — Aug. Common. 10 — 12 inches. 



Barren Strawberry. Five-finger. 



3. P. tridenta'ta, (Ait.) Stem branching, creeping at the base. 

 Leaves trifoliate., leaflets cuneiform, 3-toothed at the apex, shining above, 

 pale and pubescent beneath. Flowers small and few. Petals obovate- 

 oblong. Carpels nearly globular, villous. — Yellow. 2£. June — July. 

 6 — 8 inches. 



Genus XII. — FRAGA'RIA. Tourn. 11—12. 

 (From fro. grans, fragrant; odor of the fruit.) 



The different organs of the flower the same as in Potentilla. 

 Carpels placed on an enlarged, succulent receptacle. Perennial 

 herbs with trifoliate leaves ; receptacle red, edible. Strawberry. 



1. F. Virginia'na, (Ehrh.) Stem stoloniferous. Leaves ternate, coarse- 

 ly toothed. Flowers on cymosely divided scapes. Calyx spreading. 

 Fruit roundish-ovoid, pitted, carpels imbedded in the receptacle — 

 White. 2f . April — May. In shady places. Wild Strawberry. 



Genus XIII.— RU'BTJS. Tourn. 11—12. 

 (From rub, red, Celtic.) 



Calyx 5-parted, flattish at the base. Petals 5, deciduous. 

 Stamens numerous. Carpels pulpy, collected on a conical or 

 cylindrical receptacle. Shrubby plants, and generally with 

 prickly stems. Flowers white or rose-color. Fruit eatable. 



Raspberry. Blackberry. 



1. R. odora'tus, (L.) Stem hispid, shrubby, branched. Leaves sim- 

 ple, 3 — 5-lobed, the middle lobe elongated, acute, serrulate, toothed. 

 Flowers numerous, large. Calyx covered with glandular hairs. Petals 

 nearly orbicular. Fruit broad and flat. Yellowish and red. — Rose- 

 color. 2f . June — July. Shady places. 3 — 5 feet. 



Rose-Jlowering Raspberry. 



2. R. occidenta'lis, (L.) Stems shrubby, armed with hooked prickles, 

 glaucous. Leaves pinnate; leaflets 3 — 5, ovate, acuminate, doubly ser- 

 rate, tomentose beneath, lateral ones somewhat petioled. Flowers on 

 1 — 3-flowered axillary peduncles. Fruit roundish, nearly black, glau- 

 cous. — White. If. May — June. Mountains. 



Black Raspberry. Thimble-berry. 



3. R. vtllo'sus, (Ait.) Stem erect or bending, angular, armed with 

 stout prickles curved downward ; branches villous. Leaves 3 — 5-foli- 



