390 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



3. ASTROPHYLLUM Torr. 



Low shrub with rather thick rough stems bearing opposite, palmately5 to 10-foliolate 

 leaves crowded near the ends; leaflets linear, thick, bright green, coarsely dentate, 

 conspicuously glandular-punctate; flowers large, 10 to 20 mm. in diameter, solitary or 

 in 2 to 4-flowered clusters, axillary, white; stamens 8 to 10; ovary 5-lobed, hairy, 

 becoming a 2-celled capsule by the abortion of some of the cells. 



1. AstrophyUum diunosum Torr. U. S. Rep. Expl. Miss. Pacif. 2: 161. 1855. 



SORILLA. 



Type locality: On the Organ Mountains, New Mexico. Type collected by Pope. 



Range: Western Texas to southern Arizona. 



New Mexico: San Andreas Mountains. Dry hills, in the Upper Sonoran Zone. 



Probably the type came from the San Andreas Range rather than from the Organs, 

 for the shrub has not been found in the latter range in recent years, although it occurs 

 in the San Andreas just to the north. Pope's expedition crossed over the pass lying 

 between the two ranges. 



78. SIMARUBACEAE. Quassia Family. 



1. AILANTHUS Desf. 



1. Ailanthus glandulosa Desf. Mem. Acad. Sci. Paris 1786: 265. 1789. 



Tree-of-heaven. 

 This has been somewhat extensively introduced into the southern part of the State, 

 where it is of value as a shade tree. It frequently is 10 meters high or more. It has 

 smooth bark and leaves resembling in shape those of the sumac or walnut, 30 to 60 

 cm. long. The small, dull wliite, polygamous, very malodorous flowers are borne in 

 large terminal panicles; they are succeeded by the cluster of winged, 1-seeded, reddish 

 samaras. It is a native of Eastern Asia. 



79. MELIACEAE. China-berry Family. 



1. MELIA L. 



1. Melia azederach L. Sp. PI. 384. 1753. China-berry. 



An introduced tree, often escaped in the southern part of the State, where it is one 

 of the most common shade trees. It reaches a height of 8 to 10 meters and is widely 

 branching and umbraculiform. The leaves are large, 30 to 90 cm. long, twice pinnate, 

 with large, glossy, green leaflets. The abundant, pale lavender, sweet-scented flow- 

 ers are complete, 5 or 6-merous, with 10 to 12 monadelphous stamens, the filaments 

 being produced beyond the anthers. The "berries" are at first pulpy- but at last a 

 spherical, dry, several-seeded fruit 10 to 15 mm. in diameter. It is native in the 

 warm parts of the Old World . 



Order 29. POLYGALALES. 



80. POLYGALACEAE. Milkwort Family. 



Herbs or low shrubs with simple entire leaves and no stipules; flowers mostly small, 

 papilionaceous in appearance; sepals 2; petals 3; stamens monadelphous or diadel- 

 phous, with 1-celled anthers opening by a terminal pore; pods flat, 1 or 2-celled. 



KEY TO THE GENERA. 



Pods 1-celled 1. Monnina (p. 391). 



Pods 2-celled 2. Polygala (p. 391). 



