ALLIUM 27 



(Helobiae). n gen., 75 sp. cosmop. Water or marsh herbs with 

 perenn. rhiz. L. rad., erect, floating or submerged, exhibiting cor- 

 responding structure (cf. Sagittaria). Small scales in axils. Latex. 

 Infl. usu. much branched, primary branching racemose, secondary 

 often cymose. Fl. 5 or unisex., reg. K 3, C 3, A 6 oo , with ex- 

 trorse anthers, G6 oo, with i (rarely 2 or more) anatr. ov. in each. 

 Group of achenes. Exalb. Embryo horse-shoe shaped. Chief 

 genera : Alisma, Elisma, Echinodorus, Sagittaria. [BH. chars, add : 

 1. various, anthers also introrse, ovules also oo scattered over surface 

 of cpls., embryo also straight.] 



Alismorchis Thou. = Calanthe R. Br. p.p. (Orchid.). 



Alizarin, the dye-stuff of madder, J\nbia tinctoruin L. 



Alkali grass, Distichlis. 



Alkaloids, compounds of C, H, N, with or without O, of alkaline re- 

 action. Many here given are now classed under the more definite 

 title of purine bases. The name often indicates the genus from which 

 they are obtained, e.g. aconitin (Aconitu/n), atropin,brucin (Strycfinos), 

 caffein or them (Coffea, Thea), cinchonidin, cinchonin (Cinchona), 

 cocaine (Rrythroxylon), codeine (in opium), digitalin, hyoscyamin, 

 morphin (in opium, Papaver), nicotine, quinine (Cinchona), solanine, 

 strophantliin, strychnine, thein ( = caffein), theobromin. 



Alkanet, alkannin, cf. next. 



Alkanna Tausch. Boraginaceae (iv. 3). 35 Medit. , S. Eur. The r. 

 of A. tinctoria Tausch. gives the red dye alkanet or alkannin. 



AUaeanthus Thw. Moraceae (i). 3 Indomal. 



Allaeophania Thw. Rubiaceae (n. 5). 3 Indomal. 



Allagopappus Cass. Compositae (4). i Canaries. 



Allamanda L. Apocynaceae (i. i). 12 trop. Am., W.I. Seeds hairy. 



Allanblackia Oliv. Guttiferae (v). 5 trop. Afr. The seeds of A. 

 Stuhlniannii Eng. yield a tallow-like fat. 



Allantodia R. Br. = Athyrium Roth. (Filicin.) 



Allantodioid, applied to ferns resembling Allantodia. 



AUantoid, sausage-shaped. 



Allantoma Miers. Lecythidaceae (Myrtaceae Bff.). 12 Guiana, 

 Brazil. 



Allardia Decne. ( IValdheimia EP.). Compositae (7). 8 C. As. 



Allasia Lour. Inc. sed. ( = Vitex Tourn.?). i E. Afr. 



Allendea La Llave. Compositae (8). i Mex. 



Allenia Ewart. Euphorbiaceae (B. i). i Austr. 



Allexis Pierre. Violaceae. i Cameroons. 



Allgood, Chenopodiurn. 



Allheal, Valeriana officinalis L. ; W. Indian-, Microineria obovata 

 Benth. 



Alliaceous, onion-like. 



Alliaria Marsh, DC. (Sisynibrium BH.). Crucif. (2). 5 Eur. temp., As. 



Alligator apple, Anonapalustris L. ; -pear, Perseagi-atissima Gaertn. f. ; 

 -wood (W. I.), Guarea trichilioides L. 



Allionia L. Nyctaginaceae. i N. Am.; do. Loefl. (Mirabilis L. p.p. 

 EP.). Nyctaginaceae. 20 Am. Anthocarp glandular (cf. Pisonia). 



Allioniella Rydberg (Mirabilis L. p.p. EP.). Nyctagin. i N. Am. 



Allium (Tourn.) L. Liliaceae (iv). 300 %. A. ursiniim L. (garlic), A. 



