396 



NATURAL HISTORY OF PLANTS. 



Diplolana Dampieri. 



and they are destitute of real sepals, the leaves or upper bracts of 

 the small branches terminated by the flowers taking their place. 



In a last small group to which the 

 Chorilama should give its name, the 

 flowers, although united in cymes, 

 are collected in one inflorescence, 

 like a capitulum ; they are, more- 

 over, constructed like those of a 

 Boro?iia or Philotheca ; while in Di- 

 plolana (figs. 431, 432), whose inflo- 

 rescence has also been compared to 

 that of Composite (it really resembles 

 a true capitulum), the flowers, des- 

 titute of calyx, small, numerous, 

 and crowded, are sessile upon a receptacle with a flat surface, 

 surrounded by a large number of imbricated bracts forming an 

 involucre. 



Fig. 431. 



Inflorescence. 



Fig. 432. 



Long. sect, of inflo- 

 rescence (f). 



V. ZANTHOXYLON SEEIES (Fr., Clavelier). 



We must not take as the type of the genus Zanthoxyloti} the only 

 species which, being cultivated in the gardens in France, 

 flourishes there nearly all the year — viz., Zanthoxylum frawineum* 

 (figs. 433-438), as its flowers, generally dioecious, are destitute of 

 corolla, and differ from each other as to the number of their sepals 

 and sexual organs ; while in the most perfect species of the genus, 

 pentamerous and polygamous flowers are observed. Those which 

 are hermaphrodite, in this case bear upon a convex receptacle five 

 sepals, free or united at the base for a variable extent, imbricated in 

 the bud, and five alternate petals, imbricated or valvate in prse- 

 floration. The androceum is formed of an equal number of sta- 

 mens, alternate with the petals, each having a free filament, and a 



1 Zanthoxylum L., Gen., n. 1109 (part.). — 

 J., Gen., 374.— DC, Prodr., i. 725.- A. Juss., 

 in Mem. Mus., xii. 503, t. 25, fig. 38. — Spach, 

 Suit, a Buffon, ii. 363.— A. Gray, Gen. Ill, t. 

 156.— B. H., Gen., 297,991, n. 51.— Schnizl., 

 Iconogr., xi. t. 250. — II. Bn., in Adansonia, x. 

 321. — Zanthoxylon H. B. K., Nov. Gen. et 

 Spec, vi. 1. — Endl., Gen., n. 5972 (incl. : 

 Blackburnia Fohst., Ctcrtisia Schreb., Fagara 

 Laiuk., Kampmannia Bafin., Laearis Ham., 

 Langsdorfia Leandr., Macqueria CoMMEES., 



Ochroxylum Schreb., Pentanoma Moc. & Sess., 

 Perijcca Tux., Pohlana Nees & Mart., Pterota 

 P. Br., Rhetsa Wight & Arn., Tobinia Dest., 

 Typalia Dennst.). 



- W., Spec, iv. 757.— DC, Prodr., i. 726, 

 n. 24.— Lem. & Dcne., Tr. Gen., 365. — Z. 

 americanum Mill., Diet., n. 2. — Z. Clava- 

 Hercidis L., Spec, 1455 (nee DC, too. cit., n. 

 30). — Z. caribcewm G^RTN. (nee Lamk.). — 

 Duham., Arbr., i. t. 97. — Z. ramijiorum Michx., 

 Ft. Bor.-.-lmer., ii. 235. 



