. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. Small Leaved Horsebean 543 brown bark is about 3 mm. thick, smooth or somewhat scaly. The twigs are zig- zag, short-hcury when young, smooth when older, yellowish green, and bear spines 2 cm. long or less. The leaves are obscurely bipin- nate; the pinnae, springing from a very short enlarged spinescent stalk, are 2 to 4 dm. long, with a very flat rachis 2 to 3 mm. wide, supporting 25 to 30 pairs of distant leaflets, which
. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. Small Leaved Horsebean 543 brown bark is about 3 mm. thick, smooth or somewhat scaly. The twigs are zig- zag, short-hcury when young, smooth when older, yellowish green, and bear spines 2 cm. long or less. The leaves are obscurely bipin- nate; the pinnae, springing from a very short enlarged spinescent stalk, are 2 to 4 dm. long, with a very flat rachis 2 to 3 mm. wide, supporting 25 to 30 pairs of distant leaflets, which are linear-oblong to obovate, to 8 mm. long; on very short slender stalks. The flowers are fragrant, light yellow, and often appear throughout the year in upright few-flowered racemes 7 to 15 cm. long; calyx-tube smooth, shorter than the oblong reflexed lobes; petals spreading, nearly orbicu- lar, cm. long, the upper one red spotted; stamens about half as long as the petals. The fruit is pendent, clustered, cylindric, 5 to 10 cm. long, rather narrow, long-tapering at each end, the calyx persistent at the base; it is dark yellow to brown, with a few soft hairs when young, becoming smooth; the seeds are far apart, oblong cylindric, 10 mm. long, 3 mm. in diameter. The wood is hard, very close-grained, light brown with thick yellowish sapwood; its specific gravity is about It is frequently cultivated for ornament and hedges and the foliage often used as fodder for goats and other domestic 2. SMALL LEAVED HORSEBEAN —Parkinsonia microphyUa Torrey A small, much branched spiny tree or shrub of rather rare occurrence in the deserts of southern Arizona, southern California, So- nora, and Lower California, sometimes reach- ing the height of meters, with a trunk diameter of 3 dm. The bark is up to 6 mm. thick, usually smooth or nearly so, dark yellow. The twigs are stout and hairy, yellowish green, soon be- coming smooth, and terminated by stiff spine- like t
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