396 NATURAL HISTORY OF PLANTS. 
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 
Chorilena 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 
Boronia or Philotheca ; while in Di- 
plolena (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. 
Diplolena Dampier. 

F1G. 431. 
Inflorescence. 
Fie. 432. 
Long. sect. of inflo- 
rescence (3). 

V. ZANTHOXYLON SERIES (Fr, Clavelier). 
We must not take as the type of the genus Zanthoxylon' the only 
species which, being cultivated in the gardens in France, 
flourishes there nearly all the year—viz., Zanthorylum fravineum® 
(figs. 433-438), as its flowers, generally dicecious, 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 præ- 
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 Mém. Mus., xii. 503, t. 25, fig. 38.—Spacu, 
Suit. à Buffon, ii, 363.—A. Gray, Gen. Ill. t. 
156.—B. H., Gen., 297, 991, n. 51.—SCHNIZL., 
TIconogr., xi. t. 250.—H, Bn., in Adansonia, x. 
324,—Zanthoxylon H. B. K., Nov. Gen. et 
Spec., vi. 1. —Enpt., Gen, n. 5972 (incl. : 
Blackburnia Foxst., Curtisia ScurEs., Fagara 
LamK., Kampmannia Rarin., Lacaris HAM. 
Langsdorfia LEANDR., Macqueria COMMERS., 
Ochroxylum Scures., Pentanoma Mog. & SEss., 
Perijæa YuL,, Pohlana Nevers & Marv., Pterota 
P. Br., Rhetsa Wianr & ARN., Tobinia Dusv., 
Typalia DENNST.). 
2 W., Spec., iv. 757.—DC., Prodr., i. 726, 
n. 24.—LEM. & Done, Tr. Gén., 365. —Z. 
americanum Mizz., Dict., n. 2.— Z. Clava- 
Herculis L., Spee., 1455 (nee DC. loc. cit., n. 
30).— Z. caribœæum GÆRIN. (nec LAMK.).— 
Duuam., Arbr., i. t. 97.—Z. ramiflorum Micux., 
Fl. Bor.-Amer., ii. 235. 
