ZYGOPHYLLACEiE. 115 



Plate 145. 



TRIBULUS, Tourn. 



Calyx 5-sepalus deciduus. Filamenta nuda. Ovarium 5- 

 loculare ; locniis 3 - 5-oviilatis. Fructus 5-coccus ; coccis 

 axi centrali nullo demum sejunctis, indehiscentibus, dorso 

 tuberculatis vel spinosis, intiis inter semina superposita obli- 

 que transversim 2 - 5-locellatis, locellis monospermis. Em- 

 bryo exalbuminosus : cotyledones axi parallelae. — Herbae 

 diffusae ; foliis abrupte pinnatis, altero saspius minore. 



Tribclus, Tourn. Inst. p. 265. t. 141. Linn. Gen. 532. Schk. Handb. 

 t. 115. Gffirtn. Fr. 1. p. 335. t. 169. DC. Prodr. l.p.703 (excl. 

 spec). Adr. Juss. in Mem. Mus. 12. p. 451. t. 14. f. 1. Eiull. 

 Gen. 6030. 



Caltrops. 



Calyx of five lanceolate herbaceous sepals, scarcely unit- 

 ed at the base, quincuncially imbricated in aestivation, decid- 

 uous. Petals 5, obovate, spreading, hypogynous, larger 

 than the sepals, quincuncially imbricated in nsstivation, de- 

 ciduous. Stamens 10, hypogynous ; the five opposite the 

 petals exterior and usually a little longer than the others ; 

 the five alternate with these subtended by a gland at their 

 base on the outside : filaments filiform, naked (destitute of 

 a scale): anthers cordate or oblong, introrsc, fixed by the 

 middle, two-celled, the cells opening longitudinally. Pistil 

 of five united carpels : ovary sessile, its base surrounded by 

 an urceolate ten-lobed disk, clothed with appressed hairs, five- 

 celled ; the cells opposite the petals, three - five-locellate by 

 obliquely transverse septa : style short and thick : stigmas 5, 

 large, more or less connate, parallel or somewhat radiate, op- 

 posite the sepals (alternate with the cells). Ovules 3 to 5 

 in each cell, superposed in a single series (one in each com- 

 partment), obliquely pendulous from the inner angle, anatro- 

 pous, the raphe ventral. 



