WESTERN MIDDLE CALIFORNIA 



7 



Only the staminate (rarely the pistillate) in anient". 



Fruit a nut enclosed in a leafy tubular involucre. 



CORYLACK.K, p. 140. 



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



Clpuliferje, p. 141. 

 Leaves pinnate; only the staminate flowers in ainents; fruit a nut 

 with a fibrous coat Juglandack.e, p. 14;">. 



B. Flowers not in aments. 



i. Trees, shrubs, or woody climbers. 



Leaves opposite. 

 Flowers dioecious. 



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



reduced to scales; parasitic on trees. Lokanthace.e, p. 366. 

 Ovary superior; leaves pinnate. 



Stamens 4 or 5; fruit a double samara; var. of. ....... 



Acer Negundo, p. 2">2. 



Stamens commonly 2; fruit a simple samara 



Fraxinus Oregana, p.38o. 

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

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



Clematis, p. 197. 



Leaves alternate and simple. 



Flowers monoecious, in head-like clusters scattered on a slender axi>: 



calyx none Platanaceje, 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 



LaukacejE, p. 191. 

 Calyx 5-lobed; stamens numerous, 2o to 60, inserted on the 



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

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



stems Thymeleaceje. p. 259. 



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

 capsule 6-celled ... • . . . . Aristolochia, p. 364. 

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

 monly o-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 superior, i. e., free from the calyx. 



Calyx present; corolla none. 



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

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



KANUNruLACEj;, p. 193. 



