236 MANN, 



wise, usually ovate, and compressed, sometimes arillate. — Trees, 

 shrubs, or rarely herbs, unarmed, aculeate or spinose. Leaves bipin- 

 nate, leaflets often small, in many pairs, or the leaflets nearly or en- 

 tirely wanting and the petioles dilated vertically and taking the place 

 of the leaves (and called phyllodia). Petiolar glands often wanting. 

 Stipules spinescent or inconspicous, rarely membranaceous. Head of 

 flowers globose or a cylindrical spike, on solitary or fascicled axillary 

 peduncles, or panicled at the ends of the branches. Flowers small. 

 Stamens yellow or white, rarely as long as half an inch. Bracts usu- 

 ally 2, connate, shoi't and scale-like, either close under the head or 

 in the middle or at the bottom of the peduncles. 



A very large and diversified genus, found tlirougliout the tropics, but more especially 

 in Australia and Africa. 



1. A. KoA Gray. (Enum. No. 122.) A large forest tree, entirely 

 unarmed. Leaflets usually only appearing on young plants or shoots, 

 when they are covered, in the growing parts, with a fine golden yellow 

 silkyness. The phyllodia 3'-6' long, i' -2' wide, either tapering at 

 both ends, or very obtuse at the apex, with several strong longitudinal 

 veins, coriaceous, quite glabrous. P'lower heads on short axillary 

 peduncles, 3 or 4 heads oneach, yellow, not more than 3" in diameter, 

 on pedicels about 4" long. Pod 3' - 6' or more long, |' - i' or more 

 wide, quite flat, often a little constricted between the seeds. 



Very common in parts, excepting very wet forest regions. Native name, "Koa;" 

 the variety on the mountains with harder wood and broader phyllodia is called "Koaie." 



2. A. Farnesiaxa Willd. {Emim. No. 123.) A much branched 

 shrub 6° - 8° high, quite glabrous or slightly pubescent on the petioles 

 and peduncles. Leaves of 3-6 or rarely eight pairs of pinnae. Leaf- 

 lets 10 - 20 pairs on each pinna, linear, about 2" long. Stipules con- 

 verted into slender straight thorns veiy variable in length, the plant 

 otherwise unarmed. Peduncles usually 2 or 3 together in the older 

 axils, each bearing a single globular head of yellow or whitish sti*ong- 

 scented flowers. Pod thick, irregularly cylindrical or fusiform, inde- 

 hiscent, flUed with a pithy substance, in the midst of which lie the 

 seeds. 



Very abundant in the region of the Salt Lake (Alia pakai) and Ewa, Oahu : also be- 

 coming naturalized in other places. Supposed to be of American oi'igin, but formerly 

 much iilanted and now naturalized in almost all warm countries. 



Oeder XXV. ROSACEA. 



Trees, shrubs, or herbs, with alternate (usually) stipulate leaves, 

 and regular flowers. Calyx of 5 more or less united sepals, often with 

 as many alternate bracts. Petals as many as the sepals (or rarely 

 none), mostly imbricated in estivation, and with the numerous, dis- 



