WOOTON AND STANDLEY—FLORA OF NEW MEXICO, 305 
64. ROSACEAE. Rose Family. 
Herbs, shrubs, or trees with alternate stipulate leaves (stipules often fugacious) and 
perfect flowers; hypanthium saucer-shaped, spherical, turbinate, or tubular, often 
margined by a disk bearing the stamens; sepals and petals normally 5, rarely of a 
different number, the petals wanting in one genus; stamens numerous, sometimes 
reduced to 5; carpels 1 to many, dry or fleshy, dehiscent in a few genera; fruit of 
achenes, follicles, or druplets (in some genera the receptacle accrescent), 
KEY TO THE GENERA. 
Hypanthium constricted at the throat, fleshy or prickly, 
wholly inclosing the achenes. 
Hypanthium in fruit becoming more or less fleshy, 
not supplied with hooked bristles; carpels 
numerous; shrubs....................-....- 1. Rosa (p. 306). 
Hypanthium dry, the top surrounded by numerous 
hooked bristles; carpels few; herbs.......... 2. AGRIMONTIA (p. 309). 
Hypanthium not constricted at the throat, neither fleshy 
nor prickly, at most loosely investing the fruits. 
Fruit consisting of 1 to 5 dehiscent follicles. 
Seeds winged; leaves persistent................21. VAUQUELINIA (p. 321). 
Seeds not winged; leaves deciduous. 
Follicles more or less united at the base; 
leaves broadly ovate, lobed, 2 to 4 
cm, long....-......2++.2.+2+-------- 3. OPULASTER (p. 309). 
Follicles distinct (usually 5); leaves very 
small, spatulate, 1 cm. long or less.. 4. PeTropHyTon (p. 310). 
Fruit usually consisting of numerous indehiscent 
carpels, these becoming either achenes or 
drupelets. 
Carpels becoming more or less fleshy drupelets. 
Styles filiform; stigmas capitate; leaves 
compound; stems spiny............ 18. Rusus (p. 319). 
Styles club-shaped; stigmas 2-lobed; leaves 
simple; stems unarmed. 
Drupelets capped by hard hairy cush- 
ions; stems suffrutescent, dying 
back most of their length each 
winter; leaves large; fruit pleas- 
antly acid, pulpy...............19. Rusacer (p. 320). 
Drupelets without cushions; stems 
nearly all woody; leaves small; 
fruit usually dry.............-. 20. OREOBATUS (p. 320). 
Carpels becoming dry achenes. 
Styles articulated to the ovary, deciduous; 
herbs (except Dasiphora). 
Styles terminal or nearly so; ovules 
pendulous and anatropous...... 6. POTENTILLA (p. 310). 
Styles lateral or basal; ovules not pen- 
dulous. 
Styles nearly basal; ovules ascend- 
ing or erect, orthotropous...11. Drymoca.uis (p. 316), 
52576°—15 20 
