374 MISC. PUBLICATION 42 3, IT. S. DEPT. OF AGRICULTURE 



September. Saskatchewan to British Columbia, south to Texas, 

 New Mexico, and Arizona. 



5. ATAMISQUEA 



A shrub with rigid brittle branches, ill-scented; leaves coriaceous, 

 dark green and glabra te above, silvery-lepidote beneath, linear or 

 narrowly oblong, the margins entire, the apex emarginate; flowers 

 solitary or in small fascicles; fertile stamens 6; fruit oval or subglobose, 

 about 8 mm. long, drupelike. 



1. Atamisquea emarginata Miers, Trav. Chile 2: 529. 1826. 



Quitobaquito, southwestern Pima County (Harbison 26181). 

 Southern Arizona, Sonora, Sinaloa, and Baja California; Argentina. 

 The plant is reported to reach a height of 6 m. (20 feet), but is 

 doubtless smaller in Arizona. 



48o RESEDACEAE. Mignonette family 



1. OLIGOMERIS 



Plant annual, slightly succulent, glabrous; leaves numerous, alter- 

 nate or fascicled, linear, entire; flowers greenish, small, in slender 

 terminal spikes; sepals 4; petals 2; stamens 3; capsule turgid, 4-lobed, 

 apically dehiscent. 



1. Oligomeris linifolia (Vahl) Macbride, Contrib. Gray Herbarium 

 ser. 2, 53: 13. 1918. 



Reseda linifolia Vahl in Hornem., Hort. Hafn. 2: 501. 1815. 

 Dipetalia subulata Kuntze, Rev. Gen. PI. 1: 39. 1891. 



Maricopa, Pinal, Pima, Mohave, and Yuma Counties, 2,400 feet 

 or lower, rather common in dry sandy soil, March to June. Texas to 

 California and northern Mexico; Asia and Africa. 



49. CRASSULACEAE. Orpine family 



Plants herbaceous, usually succulent, annual or perennial, glabrous 

 or puberulent; leaves simple, entire; flowers perfect; sepals and petals 

 mostly 4 or 5, the petals separate or united below; stamens as many or 

 twice as many as the petals; pistils 3 to 5, becoming separate follicles. 



Many members of this family are cultivated as ornamentals and 

 are very popular with fanciers of succulent plants. Species of the 

 genus Sedum are favorites in rock gardens. 



Key to the genera 



1. Plants annual, small; leaves opposite; flowers minute, in axillary and terminal 



glomerules 3. Tillaea. 



1. Plants perennial; leaves alternate; flowers showy, in cymes, racemes, or open 



panicles (2). 



2. Petals separate or very nearly so, white, pink, or pale yellow; stems not 



scapose, leafy up to the inflorescence, their leaves often crowded, not 



conspicuously smaller than the basal ones; basal leaves not in a 



rosette 1. Sedum. 



2. Petals united below, the lower part of the corolla tubular or funnelform, 

 yellow, orange, or red, or marked with those colors; stems scapose or 

 subscapose, their leaves scattered, much smaller than the basal leaves 

 or reduced to scales; basal leaves in a conspicuous rosette, 2. Echeveria. 



