. 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. 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- co


. 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. 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 tips. The leaves are early deciduous, mostly falling away soon after unfolding; the pionae are to 3 cm. long, the stalks slightly winged and grooved; the leaflets, 4 to 6 pairs, are rather distant, ovate to oblong or nearly round, 2 to 4 mm. long, blunt at each end, sessile, densely hairy when unfolding, less so Fig. 502. — Small Leaved Horsebean. when old. The flowers are pale yeUow, ap-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Britton, Nathaniel Lord, 1859-1934; Shafer, John Adolph. New York : H. Holt and Co.


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