140 PULSE FAMILY. 



60. ALBIZZIA, SILK FLOWER. (Named for an Italian botanist.) 



A. Julibrissin, Durazz. SILK-FLOWER or SILK TREE. Planted S. ; 

 small tree ; leaves of 8-12 pairs of partial petioles, each with about 60 

 'oblong, acute leaflets, which appear as if halved ; panicled heads of rather 

 large, pale, rose-purple flowers ; filaments conspicuous, long, and lus- 

 trous, like silky threads in tufts (giving the popular name); pod 5'-6' 

 long, oblong-linear, very flat and thin. Asia. 



A, loph&ntha, Benth. A greenhouse shrub ; leaves with 8-10 pairs of 

 partial petioles, each with 50-60 linear bluntish leaflets ; flowers yellow. 

 New Holland. 



61. ACACIA. (Ancient name of Acacia trees.) No native species 

 north of Texas. The following are cult, in conservatories N., and one 

 of them planted or run wild far S. 



1. Leaves twice pinnate, of very numerous small leaflets. 



A. dealbata, Link. A fast-growing small tree, not prickly nor thorny, 

 pale or whitened with minute obscure down or mealiness ; leaves of 10-25 

 pairs of partial petioles (a little gland on the main petiole between each 

 pair), and very many pairs of closely set, minute, linear leaflets ; flowers 

 bright yellow in globular heads in an ample very open raceme or panicle, 

 odorous. Australia. 



A. Farnesiana, Willd. OPOPANAX. Native of South America ; naturalized 

 along the Gulf of Mexico, sometimes cult. ; a nearly smooth shrub, with 

 pairs of short prickles along the branches, small linear leaflets, small 

 heads, on short peduncles (2 or 3 together) of yellow, very sweet-scented 

 flowers, used by the perfumers. The plant also yields gum. Pod thick, 

 pulpy or pithy within. 



2. Only the leaves of the seedling twice-pinnate ; the rest simple and 

 entire mostly blade-like petioles (phyllodia, Lessons, p. 61), standing 

 edgewise, but otherwise imitating rigid simple leaves. Chiefly Australia. 



* Leaves short, and with only a central nerve or midrib. 



*- Linear awl-shaped or almost needle-shaped, prickly-tipped, small, about 

 long. 



A. juniperlna, Willd. Rigid bushy shrub ; leaves scattered ; flowers in 

 single, small, round heads. 



A. verticillata, Willd. Spreading shrub or low tree; leaves crowded 

 more or less in whorls of 5-8 or more ; flowers in cylindrical spikes. 



t- H- Obliquely oblong, lanceolate, or broader, not prickly-tipped. 



A. armata, R. Br. Tall-growing shrub ; branches usually hairy ; stip- 

 ules conspicuous, prickle-like ; leaves mostly blunt, half- ovate, oblong or 

 incurved-lanceolate, with somewhat wavy margins, feather-veined, not 

 over 1' long ; flowers in round heads. 



A. vestlta, Ker. Tall-growing shrub, soft-downy ; branches drooping; 

 leaves pale, obliquely wedge-ovate or obovate and curved, bristle-pointed ; 

 small, globular heads of flowers in racemes. 



* * Leaves 3'-6' or more long, pointless, with 2-5 parallel nerves, or when 

 very narrow only 1-nerved ; flowers in slender, loose, or interrupted axil- 

 lary spikes. 



A. longifdlia, Willd. Shrub or small tree, smooth ; branches angular ; 

 leaves from lance-oblong to linear, greatly varying, 2-5-nerved, often 

 faintly veiny between the nerves. 



A. linearis, Sims. Like the preceding, but leaves (2'-10' long) very 

 narrow-linear and with only one obvious nerve. 



