OP THE WASATCH REGION 55 



CELASTRACE^E, Staff Tree Family. 



Shrubs or trees. Leaves simple ; with small stipules 

 that very soon drop off. Flowers small; regular and 

 usually perfect. Calyx 4-5-lobed. Petals 4-5. Stamens 

 as many as the petals and alternate with them, inserted 

 on the margin of a broad disk that lines the calyx-tube 

 and sometimes covers the ovary. Styles united into 1. 

 Fruit a fleshy 2-5-celled capsule. Seeds arilled. 



1. PACHYSTIMA. Mountain Hedge; Larb. 



Low, slender-branched glabroxis shrubs. Leaves opposite; 

 leathery; evergreen; smooth; upper sxirfaee shining;; on very 

 short petioles. Inflorescence axillary; cymose. Flowers small; 

 greenish or reddish. Calyx 4-lobed. Petals 4. Stamens 4. 

 Ovary superior: 2-celled; style very short. 



1. P. Myrsinites Raf. Branches often curved. Leaves ovate 

 to elliptical; wedge-shaped at base; serrate or serrulate. In 

 dense clumps on wooded slopes. May-July. 



ACERACE^. Maple Family. 



Shrubs or trees. Leaves opposite; simple or com- 

 pound. Flowers small and regular, appearing before 

 or with the leaves ; in polygamous or dioecious racemes 

 or umbel-like corymbs. Calyx usually 5-lobed; petals 

 equal in number to calyx-lobes or none ; stamens 3-12, 

 usually 8; and pistil 1 with 2 long styles. Ovary 2- 

 celled, 2-lobed, ripening into a pair of winged fruits 

 (samaras). Ovules 2 in each cell. 



1. ACER. Maple. 



Wings extending- in one direction from the seed, not de- 

 veloped equally on all sides. 



Leaves simple, palmately-lobed. 

 Petals present. 



Cultivated; leaves large. 



Flowers in corymbs 1. A. platanoides 



Flowers in drooping racemes 2. A. Pseudo-platnnns 



Native ; leaves small 3. ' A. glabriim 



Petals wanting-. 



Flowers appearing- with or just before the 



leaves 4. A. grandidentatum 



Flowers appearing much before the 



leaves 5. A. saccharinum 



Leaves pinnately-compound 6. A. Negundo 



