660 TRIDENS 



Tridens Roem. et Schult. (Triodia p.p.)- Gramineae (10). 7 N. Am. 



Tridesmis Lour. (Croton p.p. El'.}. Euphorbiaceae (A. n. i). i 

 China. 



Tridesmostemon Engl. Sapotaceae (i). i Cameroons. 



Tridianisia Baill. Icacinaceae. i Madag. 



Tridimeris Haill. Anonaceae (i). i Mexico. 



Tridophyllum Neck. (Potentilla p.p.). Rosaceae (in. 2). 9 Am. 



Trientalis Rupp. ex L. Primulaceae. 2 N. temp. T. europaea L. 

 (chickweed winter-green) in Brit. Rhiz. with erect stem bearing about 

 4 7 1. in a tuft and a few 7-merous fls. 



Trifax Nor. Inc. sed. Nomen. 



Trifolium (Tourn.) L. Leguminosae (ill. 4). 290 temp, and subtrop.; 

 20 in Brit, (clover, trefoil, shamrock). The fl. has the simplest mecha- 

 nism in the fam., the sta. and style emerging as the keel is depressed 

 by an insect resting on the wings, and returning when it is released. 

 The fls. of white clover are an important source of honey ; those of red 

 clover are too long-tubed for hive-bees and are visited by humble-bees. 

 T. subterraneitm L. has two kinds of infl., one normal, the other be- 

 coming subterranean. Only 3 or 4 of its fls. develop, the rest forming 

 grapnels (each sepal forming a reflexed hook); the stalk of the infl. 

 bends downwards and gradually forces the fls. under the earth, where 

 the fr. ripen (cf. Arachis). T. badinm Schreb. has a wing upon the 

 fr. formed by the persistent C., T. fragiferum L. a bladdery 'wing' 

 formed by the K. The clovers are important pasture and hay plants ; 

 among the chief are T. repens L. (white or Dutch clover), T. fratcnsc 

 L. (red clover), T. hybridum L. (alsike), &c. 



Triglochin Riv. ex L. Scheuchzeriaceae. 1 2 cosmop. ; 2 in Brit, (arrow- 

 grass), in fresh water- or salt-marshes ( T. palustre L. and T. mariti- 

 nnun L.). Tufted herbs with leafless flg. scapes ending in spikes or 

 racemes. L. linear, fleshy in the maritime sp. P 3 + 3, A 3 + 3, G 

 (3 + 3)i or sometimes 3 with 3 abortive cpls. between the fertile. By 

 a process of secondary growth the inner whorl of P comes to stand 

 higher on the axis than the outer sta. Fl. protog., wind-pollinated. 

 The pollen collects in the hollowed bases of the P-leaves. The ripe 

 cpls. surround a central beak (cf. Geranium), and are prolonged out- 

 wards at the base into long sharp spines, by whose means, breaking 

 away from the beak, they may be animal-distr. 



Trigonachras Radlk. (Sapindus p.p. BH.}. Sapindaceae (i). 2 Malaya. 



Trigonella L. Leguminosae (in. 4). 70 Medit., Eur. (i Brit.), As., 

 S. Afr., Austr. T. Foenum-graecum L. (fenugreek) is sometimes cult, 

 as curry stuff and for veterinary medicine. The fls. of T. Aschersoniana 

 Urban bury themselves like those of Arachis. 



Trigonia Aubl. Trigoniaceae. 26 trop. Am. 



Trigoniaceae (EP. ; Vochysiaceae p.p. BH.}. Dicots. (Archichl. 

 Geraniales). 2 gen., 28 sp., trop. Am., Malaya. Woody pi., often 

 climbing, with alt. oropp. L, slip, or not, and ? obliquely -|- fls. K (5), 

 C 5, A 5, 6, or 10 12, united below, G (3) each with x 2 ov. 

 Caps. Endosp. Chief genus: Trigonia. 



Trigoniastrum Miq. Trigoniaceae. i Malaya. 



Trigonidium Lindl. Orchidaceae (n. 18). 9 trop. Am ; 



Trigonocapnos Schlechter. Papaveraceae (m). T S. Afr. 



