ROSACER. 49 
e Flowers yellow, white or purple: calyx appendaged between the lobes, or apparently un- 
equally 10-tobed. 
Stamens 20 or more: carpels very numerous: receptacle conical to clavate 
Akenes with hooked or plumose tails.......... ddaes de aoverbosoancrecalaCMiase ease elaha eves 12 
Akenes seed-like on a juicy receptacle: leaves 3-foliolate...........+seseeeee- 13 
Akenes seed-like on a dry receptacle. (Try No. 16 and 17.)........ noses navel 
Stamens 20 or less: carpels few or many on a dry receptacle. 
Stamens 10 (or 20 and corolla pink): corolla white: receptacle nearly naked....16 
Stamens 5 to 20; filaments slender: carpels few or 1: receptacle hairy.......... 17 
Stamens 5: carpels 5 to 10: leaflets 3, cuneate, 3-5-toothed..............-.-... 15 
d. Flowers small: carpels 1 to 8 becoming akenes enclosed by the firm calyx-tube forming a 
apparently inferior ovary. 
Leaves pinnate flowers in heads or spikes. 
Calyx with barbed prickles: petals none: anthers purple...........-......--6- 21 
Calyx with a margin of hooked prickles: petals yellow.............-.e.eee0-s 20 
Calyx 4-angled, naked, limb petaloid: petals none...........-.0eeeeeeeeee ee ee 22 
Leaves palmately lobed: greenish apetalous flowers axillary.................-2.-00- 19 
fh 
1. PRUNUS, Tournefort. ae 3 
Flowers white: scraggy or spiny: leaves ovate, an inch long or less.............. 1,3 
branches slender: leaves 1 to 4 inches long........-...0+ese+20005 2,4 
low: leaves spatulate, entire, 6 lines long, sessile.................... 7 
evergreen leaves, shining, prickly toothed, broad............. ...... 5 
Flowers rose-color: low, spiny: leaves oblanceolate, 6 to 12 lines long................ 6 
[The first species is a small plum, the others scarcely edible cherries. ] 
1, P. subcordata, Benth. Bark ashy gray: flowers in small lateral clusters. 
2. P. emarginata, Walpers. Bark chestnut brown: corymbs 6-12-flowered. 
Var. mollis, Brewer. Taller, becoming 25 ft. high, woolly. Oregon. 
Fremonti, Walp. Flowers solitary or few together: ovary densely hairy. 
demissa, Walp. Dense racemes 3-4 inches long, erect: leaves large. 
ilicifolia, Walp. Racemes small, axillary: fruit ripening in November, 
Andersoni, Gr. Low, diffuse: leaves oblanceolate, acute: fruit velvety. 
fasciculata, Gr. Similar: slender petals recurved: stamens 10-15: 
MD Ow os 
rd td dW PY 
2. NUTTALLIA, Gray. 
1. N. cerasiformis, T. & G. Diccious: 1 to 4 of the carpels maturing drupes. 
3. SPIRZZA, Linneus. 
* Shrubs with rose-colored or purplish flowers: carpels 5. 
1. 8. betuleefolia: Pallas. Pale purple flowers in corymbs. Alpine. 
9 
