118 TREES AND SHRUBS 



CELASTRACEAE. Staff-tree Family 



Low shrubs, sometimes spiny; leaves simple, small, alternate 



or opposite; flowers normally cymose, small and inconspicuous, 



perfect; calyx and corolla 4 or 5-merous; stamens 4 to 10, inserted 



on a disk lining the hypanthium : fruit a capsule, drupe, or berry, 



the seeds often arrillate. 



Stamens 10; plant spiny, stem green. # sia. 



Stamens 1 or W '>r brown. 



Flowers 4-merous; fruit a 2-ovaled capsule 



■ pposite, smooth. HYSTIMA. 



j-merous; fruit iniieli 



ll-fy. kiORTONIA. 



I. FORSELLESIA Greene. . 

 A low, spiny, green stemmed shr - high or 



with small, obovate, acute leaves 1 cm. lo "Oth, 



shnrl petioled, entire; flowers small, pentamerous, white. 



1. F. spinescens. 



2. PACHJSTIMA Raf. 

 A prostrate woody evergreen plant with stems a foot or less 

 and small opposite short petioled leaves on small inconspicu- 

 ous flowers. Of no importance. 



1 P. myrsinttes. 



3. M0RT0NIA 



A rare plant from the extreme southwestern corner of the 



state; leaves elliptic, thick, entire, acute, contracted into a very 



short petiole, crowded, 1 cm. long or less; stems yellowish like the 



leaves; flowers in short terminal braceate racemes; whole plant 



- ly scurfy. 



1. .V. srabrella. 



JANUSIA Juss. 



Low twining perennial vine, with woody stem-: leaves op- 

 posite, narrowly lanceolate, about 1 inch long, pubescent on 



both surfaces; sepals 5; petals 5, yellow turning reddish brown: 

 stan united; fruit a samara. to 12 mm. long. 



A single species in the Lower Sonoran Zone. 1. J. gracilis. 



