Flora of the Malayan Pniinsitla. 643 



Eoxb. Hort. Beng. 46, and Fl. Ind. III. 52. Adenosvm triflora, Nees 

 in Wall. PL As. Ear. III. 79, and in DC. Prodr. XI. 68 ; T. Anders, in 

 Journ. Linn. Soc. IX. 454 (1867). 



SiNGAPOEE : fide C. B. Clarke (in Hook. f. I. c). — Distrib. Abundant 

 in Bengal, extending to Pegu. 



I do not find now in thie Kew Herbarium any example of this from Singapore ; it 

 is nearly sure to grow in tlie Malay Peninsula. 



5. Hygrophila, R. Br. 



Herbs, attaining 1 to 5 ft. high, more or less hairy. Stems quad- 

 rangular. Leaves opposite, equal, entire or crenate ; the upper surface 

 full of rhaphides. Flmvers in continuous spikes or axillary clusters. 

 Calyx "25 to "5 in. long, with 5 acute teeth, the lower half tubular in the 

 bud, often with 5 lines of very thin tissue, and split deeply in the 

 fruit ; or 4-fid in H. spinosa. Corolla distinctly 2-lipped ; lower lip 

 trifid, the middle segment broader, emarginate. Stamens 4, didy- 

 namous, subsimilar, fertile (except in H. polysperma, where the two 

 lower are filaments only or nearly obsolete) ; filaments glabrous or 

 nearly so ; anthers of two parallel subequal muticous cells ; pollen 

 globose, 15 to 35 ^ in diam., with 12 to 18 longitudinal ribs. Ovary 

 oblong, with 8 to 80 ovules ; iipper part of ovary and style more or less 

 hairy ; style with one linear branch, the other reduced to a small rudi- 

 ment. Capsule -25 to "5 in. long, linear-oblong, seed-bearing from the 

 base ; seeds 8 to 80, ovoid, flat, 50 /a in diam., brown, nearly smooth on 

 faces, shaggy, with hygroscopic hairs on margin. — Distrib. Species 

 40, in the warmer parts of the globe ; these fall into three well-marked 

 subgenera, the species of each of which are so closely allied as to be 

 esteemed subspecies only by some competent botanists. 



Subgenus 1. Hemiadelphis (genus), Nees. Unarmed. Flowers 

 in terminal spikes : — "' 



Fertile stamens 2 : — * 



Bracts oblong or elliptic, as long as the calyx . . 1. H. polysperma. 



Subgenus 2. Euhygrophila. Unarmed. Flowers in distant axil- 

 lary clusters : — 

 Leaves lanceolate acute or linear : — 



Flowers in dense axillary clusters . . . . .. 2. H. angustifolia. 



AxUlary clusters small, often 3- to 1-fiowered . . .. S. H. satcatilis. 



Leaves obovate or oblong, triangular or obtuse at tip : — 



Leaves oblong, all sessile or nearly so . . .. 7. H, subsessilis. 



Leaves, or at least lower leaves, petioled : — 



Corolla -25 to -35 in. long . . . . .. 5. H. memntlios. 



17 



