Amyris. RUTACE^. 375 



oblong, rounded or very obtuse at each end, glabrous : flowers in small terminal corymbose 

 panicles. — Bull. Torr. Club, x. 90. X. Clava-HercuUs, var., Wats. Proc. Am. Acad. xvii. 

 335. — S. W. Texas, near Corpus Christi, Buckley ; also at Lamar, Aransas Co., on Copano 

 Bay, Palmer, no. 2125. Perhaps only an extreme form of the preceding variety, which 

 approaches it through a host of intermediates. 



X.* flavum, Vahl.1 (Satin-wood.) Tree unarmed, young shoots and foliage minutely 

 stellular-pubescent and canescent, early glabrate : leaflets oblong-ovate or oblong, distinctly 

 petiolulate, irregularly and sometimes obscurely crenulate and with numerous small glands 

 along the margins, in age subcoriaceous and shining, minutely reticulated ; those of sterile 

 branches 7 to 11 and mostly acute or acuminate, 2 or 3 inches long; those near the fertile 

 paniculate cymes 5 to 7 (rarely reduced even to one) obtuse or barely acute : flowers some- 



, times 4-merous, white or yellowish : carpels 2 to 4 with very short and cohering styles, in 

 fruit rather short-stipitate. — Eclog. Am. iii. 48. X. crihrosum, Spreng. Syst. i. 946. 

 ? X. Elephantiasis, Macf. Fl. Jam. 193. X. Floridanum, Nutt. Sylv. iii. 14, t. 85 ; Chapm. 

 n. 66. X. Caribceum, Wats. Bibl. Index, 155, not Lam. X. Carihamm, var. Floridanum, 

 Gray, Proc. Am. Acad, xxiii. 225. Fagara fiava, Krug & Urban in Engl. Jahrb. xxi. 571. 



— Keys of S. Florida, Blodgett, Curtiss, Sargent. (W. Ind.) The specimens lack the angu- 

 larity and thickening or wartiness of peduncles and their divisions of the W. Indian X. Cari- 

 boium and of X. Elephantiasis, Macf. (which is like ours unarmed), nor are these glabrous. 



§ 4. Perianth complete : flowers 3-merous, in terminal cymes : leaves coria- 

 ceous, mostly dotted only along the margins, and there sometimes obsoletely or 

 obscurely. — Tobinia, Desv. in Hamilton, Prodr. Fl. Ind. Occ. 56 ; Griseb. Abb. 

 Gott. Ges. vii. 189. 



X.* COriaceum, A. Eich.^ Shrub, unarmed or with some small and sparse acicular 

 prickles, very glabrous : leaflets 4 to 8, more or less obovate (1 to 3 inclies long) obtuse or 

 retuse or sometimes more notched, shining especially above, transversely veiny and reticu- 

 lated : flowers in dense cymes: carpels 2 or 3, not stipitate. — Fl. Cub. 326, t. 34; Walp. 

 Eep. ii. 825, not i. 521. X. emarginatum, Wright. & Sauv. Fl. Cub. 19; Sargent, Silv. i. 

 65, note ; not Sw. ace. to Urban. Fagara coriacea, Krug & Urban in Engl. Jahrb. xxi. 591. 



— Miami, S. Florida, Garber. 



6. CNEORlDIUM, Hook. f. (Like Cneorum, a S. European and N. 



African genus.) — Benth. & Hook. Gen. i. 312; Brew. & Wats. Bot. Calif, i. 



97 ; Gray, Proc. Am. Acad, xxiii. 223. Pit.avia § Gastrostyla., Torr. Bot. Mex. 



Bound. 43. — Single species. 



C. dumosum, Hook. f. 1. c. Low shrub, much branched, Eue-scented and somewhat 

 balsamic, glabrous : leaves opposite, crowded, spatulate-linear, sessile, obtuse, about inch 

 long, entire, nearly veinless (except midrib), opaque and subcoriaceous (pungent in taste), 

 evidently glandular-dotted especially the lower surface and margins : peduncles axillary and 

 terminal, short, 1-3-flowered : petals white, 2 lines long, widely spreading, often sparingly 

 glandular-punctate : fruit 2 or 3 lines in diameter, obscurely stipitate or sessile ; the epicarp 

 sparsely glandular-punctate. — Pitavia dumosa, 'Nutt. in Torr. & Gray, Fl. i. 215. — Coast 

 of S. California, at and near San Diego ; fl. spring; first coll. by Nuttall. (Lower Calif., 

 Pr ingle.) 



7. AM"^RIS, P. Browne. Torch-wood, Rose-wood. ('A intensive and 

 fivpov, balsamic juice, which the trees yield.) — Small trees or shrubs (Tropical 

 American), with translucent-dotted 1-5-foliolate leaves, heavy and very resinous 



1 The name and synonymy of this species have been altered in the light of Professor Urban's 

 recent critical work upon the group (see Engl. Jahrb. xxi. 571). It seems best, however, to retain the 

 genus Xanthoxylum in its comprehensive sense, as interpreted b}' Dr. Gray. 



2 The nearly related X. emarginatum, Sw., of Jamaica, to which Dr. Graj' referred this plant, 

 appears to be distinct, as pointed out by Urban, 1. c. 590-592, since it has ovate rather than obovate 

 leaves and (ace. to Urban) smoother fnut- 



