ALISMACEAE 
229 
Aizoon. Aizoaceae (11. 2). 10 sp. Afr. , Medit. Sta. 00 in bundles. 
Ajuga Linn. Labiatae (l. 1). 30 sp. temp. A. reptans L. the bugle, 
and two others in Brit. The corolla has no upper lip, the sta. being 
protected by the bract above. Vegetative reproduction by runners. 
Akebia Dene. Lardizabalaceae. 2 sp. China, Japan. A . quinata 
Dene, is often cultivated. Its firs, are monoecious, the lower in the 
raceme usually ? . The ? is much larger than the $ , a very unusual 
thing. The berries dehisce like follicles. 
Alangium Lam. Cornaceae. 4 sp. Malaya. 
Albizzia Durazz. Leguminosae (1. 1). 50 sp. trop. and sub-trop. 
Old World. A. Lebbek Benth., and others, yield valuable timber. 
Albuca Linn. Liliaceae (v). 30 sp. Afr. Outer sta. often staminodes. 
Alchemilla Linn. Rosaceae (in. 9). 40 sp. temp. Fir. inconspicuous, 
with epicalyx, apetalous; sta. 2 or 4; cpls. 1 — 4, each with 1 ovule. 
Achenes enclosed in dry recept. A. arvensis Scop (parsley-piert), 
A. vulgaris L. (lady’s mantle) and A . alpina L. occur in Brit. The 
last covers large areas in the Highlands; it has hairy leaves, more 
divided than those of the preceding sp., and the change from one type 
to the other is very noticeable in ascending the hills. The firs, of all 
Brit. sp. are visited by flies. 
Alchomea Sw. Euphorbiaceae (A. 11. 2). 30 sp. trop. A. ( Coelebogyne ) 
ilicifolia Miill.-Arg. is only cultivated in the female form, but pro- 
duces good seed. Adventitious embryos are formed by budding 
of the nucellus-tissue round the embryo-sac (cf. Funkia). 
Aldrovanda Monti. Droseraceae. 1 sp. A . vesiculosa L. Eur., As. 
It is a rootless swimming plant, with whorls of leaves. Each of these 
has a stalk portion and at the end of this a few bristles and a blade 
like that of Dionaea (q.v.) provided with glands and trigger hairs. 
Mucilage is also secreted by stellate hairs on the leaf. Small water 
animals are captured and digested as in Dionaea (see Darwin, Goebel, 
&c. and p. 178). Winter buds (p. 159) are formed in colder climates. 
Aletris Linn. Liliaceae (ix). 8 sp. E. As. and N. Am. 
Aleurites Forst. Euphorbiaceae (A. 11. 3). 5 sp. trop., sub-trop. 
Extrafloral nectaries occur on the petiole and at the ends of the large 
leaf- veins (see Groom, Ann. of Bot. 1894). The seeds yield an oil. 
Alfredia Cass. Merged in Carduus Linn, (same spec, names). 
Alhagi Tourn. Leguminosae (ili. 7). 3 sp. Steppes and Medit. 
Thorny xerophytes. In the dry season the rootstock is blown about 
by the wind. A honey-like sap exudes from all sp. in hot weather, 
hardening into brownish lumps during the night (manna). 
Alibertia A. Rich. Rubiaceae (1. 8). 20 sp. trop. Am. 
Alisma Linn. (incl. Caldesia Pari.). Alismaceae. 6 sp. cosmop. 
A . Flantago L., the water- plantain, in Brit. Sta. 6, due to doubling 
of outer whorl, coherent at the base, forming a nectary. For A . natans 
L. see EHsma. 
Alismaceae. Monocotyledons (Helobieae). 10 gen. with 50 sp. temp. 
