WESTERN My>DLE CALIFORNIA. 7 



Only the staminate (i-arely the pistillate) in ameiits. 

 Fruit a nut ehcloisecl in a leafy tubular involucre. . 



CoKYLACBiB, p. 140. 



Fruit a nut set In a scaly cup or bur (acorn or chestnut) . 



CxrpULirEK^, p. 141. 

 Leaves pinnate; only the staminate flowers in aments; fruit » nut 

 with a fibrous coat. . . ,TuQLANDACE.ffl), p. 145. 



B. Flowers not in aments. 

 I. Trees, shrubs, or woody climbers. 

 Leaves opposite. 

 Flowers dicecious. 



Ovary inferior; fruit a berry; leaves simple and foliaeeous or 



reduced to scales; parasitic on trees. LoRANTHACE.a;, p. 365. 

 Ovary superior; leaves pinnate. 



Stamens 4 or 6; fruit a double samara; var. of. . . 



Acer Negundo, p. 252. 



Stamens commonly 2; fruit a simple samara 



Fraxinus Oregana, p.385. 

 Flowers dioecious or polygamo-dicecious; sepals 4, petal-like; sta- 

 mens numerous; fruit a tailed achene; climbing plants . . 



Clematis, p. 197. 

 Leaves alternate and simple. 



Flowei-s monoecious, in head-like clusters scattered on a slender axis; 



calyx none Platanace^, p. 274. 



Flowers perfect or unisexual; sepals and stamens 4 or 5; fruit berry- 

 like ... . . ... Rhamnus. p. 253. 



Flowers perfect. 



Stamens 6 to numerous. 

 Erect trees or shrubs. 

 Calyx of 6 petal-like sepals; stamens 9, the anthers opening 

 by uplifted valves; fruit a drupe; evergreen. . . 



Laukacb,e, p. 191. 

 Caly.x 5-lobed; stamens numerous, 25 to CO, inserted on the 



calyx; fruit a tailed achene . . Cercocarpus, p. 277. 

 Calyx 4-cieft, corolla-like; low shrub with tough leathery 



stems. . TuYMELEACEiB, p. 259. 



Climbing plant; calyx tubular; stamens 6, anthers sessile; 

 capsule 6-celIed ... ■ . . . . Aristolochia, p. 364. 

 Stamens 5, monadelphous; calyx 5-cleft; showy; capsule com- 

 monly 5-celled Fremontia, p. 236. 



Stamens 1 or 2; calyx of 4 or 5 sepals; leaves much reduced and 

 scale-like . . . ... . Allenrolfea, p. 181. 



2. Herbs. 

 * Ovary supeeioh, i. e., free from the calyx. 



Calyx present; coro/l/i none. 



Pistils more than 1 and distinct, becoming achenes; sepals com- 

 monly 5, distinct, often petal-like; stamens many 



Kanunculace^, p. 193. 



