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May (L linear in clusters dark)

l. linear, in clusters, dark green, scattered or whorled. h. 20ft. Tasmania. Habit graceful, like a weeping willow. Very handsome and distinct. SYN. A. setigera.

A. rotundifolia (round-leaved). fl. yellow; heads globose, solitary, on long peduncles. March. l. phyllodia on short petioles, obliquely rounded, obtuse or retuse, mucronate. Branches angular, puberulous. h. 6ft. New Holland, 1842. A. saligna (Willow-like). fl. yellow; heads solitary, on short peduncles. March. l. phyllodia linear, attennated at both ends, quite entire, almost nerveless. h. 6ft. to 10ft. New Holland, 1818. Greenhouse species. A. Senegal (Senegal). Gum Senegal. fl. white, small, glabrous, distant; spikes axillary, solitary, slender. l. with five to eight pairs of pinnae, each pinna bearing fifteen to eighteen pairs of oblong-linear, obtuse, glabrous leaflets; branches white; prickles sometimes wanting. h. 20ft. Arabia, 1823. Stove species.

A. setigera (bristly). Synonymous with A. Riceana.

A. sophorae (Sophora-podded). fl. yellow; spikes usually twin, axillary. May. l. phyllodia obovate, oblong or lanceolate, quite entire, many nerved; sometimes there are bipinnate leaves at the tops of the branches. h. 20ft. New Holland, 1805.

A. sphaerocephala (round-headed).* fl. yellow; racemes axillary, usually twin, ovate-roundish. l. with numerous close-set linear falcate pinnules, which are usually tipped by a glandular yellow "food body;" spines twin, hollow. Mexico. A very remarkable stove species, inhabited by ants during certain seasons in its native country.

A. uncinifolia (hook-leaved). fl. yellow; spikes usually twin, dense, on short peduncles, cylindrical. March. l. phyllodia long, linear-subulate, flat, recurved, mucronate, three-nerved; branches angular. h. 6ft. Swan River, 1846. A. vera (true). Egyptian Thorn; Gum Arabic. fl. white, usually in twin heads, pedunculate, axillary. July. l. with two pairs of pinnae, each pinna bearing eight to ten pairs of oblong linear leaflets; branches and spines red. h. 20ft. Egypt, 1596.

A. verticillata (whorl-leaved).* fl. yellow; spikes axillary, solitary, oblong. March. l. phyllodia linear, ending in a pungent mucrone, disposed somewhat verticillately. h. 6ft. to 10ft. A spreading, prickly, greenhouse species, of variable habit. New Holland, 1780.

A. vestita (clothed).* fl. yellow, in loosely racemose heads, along the peduncles; upper ones solitary. June. l. phyllodia obliquely elliptic-lanceolate, one-nerved, ending in an awnlike mucrone, hispid. h. 4ft. New Holland, 1820.

A. viscidula (clammy).* fl. yellow; heads globular, on short stalks, axillary, solitary or twin. February. l. linear, clammy; branches slender, clammy. h. 6ft., erect. New South Wales, 1844.

ACAENA (from akaina, a thorn; in allusion to the slender spines on the calyx or fruit). ORD. Rosaceae. A genus of dwarf sub-shrubby plants. Flowers capitate, or interruptedly spicate, uninteresting; petals absent. Leaves alternate, impari-pinnate. Excepting for rockwork, or as edgings to flower beds, they are not of much value; their habit is, however, very compact and neat. They require similar treatment to other hardy herbaceous plants, in ordinary soil. Increased by cuttings, creeping rootlets, divisions, and by seeds.

A. microphylla (small-leaved).* fl. green, small, in close heads, furnished with showy, long crimson spines. Summer. l. small, pinnate. h. 1in. to 2in.