254 xxvii. TiLiACEiE (masters). [Grewia. 



socarp fibrous. Embryo straight in horny albumen ; radicle directed to the 

 hilum. Cotyledons flat, ovate, acute. 

 Upper Guinea. Sierra del Crystal, Mann ! 



4. TRXCMFETTA, Linn. ; Benth. et Hook. f. Gen. PL i. 234. 



Sepals 5, distinct, frequently hooded and provided with a little point at 

 or near the apex. Petals 5, glandular beneath. Stamens 10-25, inserted 

 upon a fleshy, lobed, glandular torus. Ovary 2-5-celled with 2 ovules in 

 each cell.. Style filiform ; stigma 5-toothed. Capsule small, globose or ob- 

 long, echinate or setose, indehiscent or dividing into 3-6 valves. Seeds 1-2 

 in each cell, pendulous, albuminous ; embryo straight. Cotyledons flat, 

 leafy. — Herbs or shrubs more or less covered with stellate hairs. Leaves 

 serrated, entire or lobed. Flowers yellowish, arranged in close cymes which 

 are pliced opposite to the leaves, along the sides or at the ends of the 

 branches. 



A considerable genus, chiefly tropical. The species are, some of them, widely distributed 

 as weeds in cultivated fields, their bur-like fruits offering facilities for extensive distribution. 

 The duration of the species as well as the degree of hairiness vary with the situation in 

 which the plants grow. The form of the leaves is likewise subject to very great variation, 

 but the characters afforded by the fruits are more coustant. 



Fruit indehiscent. (Sect. Lappula.) 



Stamens 20. Prickles of fruit appressed, covered on all sides with 



short white hairs 1. T.fiavescens. 



Stamens 5. Prickles appressed with a few short white hairs on the 



edges and upper surface only 2. T. neglecta. 



Fruit dehiscent. (Sect. Bartramea.) 



Flowering stem leafless or nearly so. Flowers appearing before the 

 leaves. 



Bristles of fruit spine-pointed. Leaves lanceolate 3. T. Welwitschii. 



Bristles of fruit tipped with a tuft of fine hair. Leaves roundish, 



lobed 4. T. geoides. 



Flowers produced at the same time as the leaves and on the same 

 stems. 

 Prickles terminating in a thickened, well-marked hook. 



Fruit glabrous or nearly so. Prickles glaucous, not dilated at 



the base 5. T. annua. 



Fruit downy or villose. 



Fruit small with close white down between the prickles . . 8. T. rhomboidea. 

 Fruit large, villose. Prickles shaggy, conical. Flowers nearly 



an inch long 1. T. pilosa. 



Fruit more or less villose. Prickles shaggy, scarcely dilated 



at the base. Flowers less than half an inch long . . . 6. T. semitriloba. 

 Prickles of the fruit straight or nearly so at the apex, smooth or 

 villose at the base. 

 Prickles simple at the points. 



Stem prostrate, creeping > .... 9. T.glechomoides. 



Stem erect. 



Prickles short, broad at the base 12. T. Heudelotii. 



Prickles long, not broad at the base. 



Prickles black. Lower leaves broad 10. T. tomentosa. 



Prickles broad. Leaves narrow 11. T. orthacanlha. 



Prickles with a tuft of fine hairs at the extremity . . . . 13. T. seiulosa. 



