Julibrissin 



519 



to 3 times the length of the corolla, their filaments united into a tube at the 

 base; ovary smooth and stalked; style filiform. The pod ripens in August and 

 persists on the branches until the flowering season; it is linear-oblong, flat, leath- 

 ery, 7 to 12 cm. long, about 1.5 cm. wide, taper-pointed, obliquely tapering into 

 the stalked base, brown outside, yellow inside, splitting readily through the thick 

 margin; the seeds are transverse in the pod, flattened, ovate to orbicular ovate, 

 6 mm. long, dark brown and shining, with an oval depression on each side. 



The wood is rather hard, close-grained, dark red-brown, and very heavy. 



There is but one species known of the genus Havardia; its name is in honor of 

 Colonel Valery Havard, M.D., of the United States Army, who has made many 

 valuable contributions to our knowledge of the botany of the various regions in 

 which his active miUtary career has stationed him. 



IV. JULIBRISSIN 



GENUS ALBIZZIA DURAZZINI 

 Species Albizzia Julibrissin Durazzini 



vm3 



N Asiatic tree, long planted for ornament and shade in the southern 

 States, where it is hardy as far north as the District of Columbia; it 

 has become naturalized in woods and thickets from Virginia to Florida 

 and Louisiana. Its maximum 

 height is 12 meters, with a trunk diameter of 

 5 dm. 



The branches are long and wide-spread- 

 ing, forming a rather round-headed tree. 

 The bark is thin and scaly. The twigs are 

 slender, somewhat angular, spineless, smooth, 

 and yellowish brown. The leaves are evenly 

 bipinnate, 2 to 4 dm. long, including the leaf- 

 stalk, which is 1 to 1.5 dm. long; there are 

 8 to 12 pair's of pinna, all of nearly equal 

 length, about 10 cm. long, and the axis ter- 

 minated by a spine-hke projection; leaflets 25 

 to 35 pairs, oblong, 10 to 15 mm. long, un- 

 equal, the upper margin being straight and 

 scarcely 2 mm. from the midrib, which pro- 

 trudes beyond the blade, forming a promi- 

 nent tip, the lower margin rounded ; the mar- 

 gins are strongly revolute, veins prominent; 

 the upper surface is dark green, the lower surface is paler and hairy. The flowers 

 are pink, in showy loose panicles of compact heads 4 to 6 cm. in diameter, on 

 slender stalks 4 to 5 cm. long; the calyx is small, one third the length of the 



Fig. 480. — Julibrissin. 



