COMMELINACEZ. 397 
11. ZEBRINA. 
Zebrina, Schnizl. in Bot. Zeit. 1849, p. 870; Benth. et Hook. Gen. Plant. iii. p. 856. 
Apparently monotypic, for although Clarke doubtfully proposes a second species 
founded on Tradescantia leiandra, var. brevifolia, Torrey (Bot. U.S. & Mex. Bound. 
Surv. p. 225), S. Watson asserts (Proc. Am. Acad. xviii. p. 167) that the plant in 
question is a genuine Tradescantia. 
1. Zebrina pendula, Schnizl. in Bot. Zeit. 1849, p. 870; Dene. in Revue Horti- 
cole, 1855, p. 141, t. 8; C. B. Clarke in DC. Monogr. Phanerog. iii. p. 318. 
Cyanotis vittata, Lindl. in Journ. Hort. Soc. Lond. v. p. 189. 
Cyanotis zebrina, Nees in Delect. Sem. Hort. Vratislav. 1850. 
Sourn Mexico, Orizaba (Bourgeau, 2854). Hb. Kew. 
12. WELDENTA. 
Weldenia, Schultes f. in Flora, 1829, p. 8, t.14; Benth. et Hook. Gen. Plant. iii. p. 856. 
An herbaceous monotype. 
1. Weldenia candida, Schultes f. in Flora, 1829, p. 3, t.1a; C. B. Clarke in 
DC. Monogr. Phanerog. iii. p. 319. 
Weldenia schultesii, Schl. Hort. Hal. p. 14. 
Lampra volcanica, Benth. Pl. Hartw. p. 95; Hook. Ic. Pl. xiii. p. 28, t. 1236. 
South Mexico, between Chico and Real del Monte (Ehrenberg), Nevado de Toluca 
(Karwinski), Cuesta de Catinga (Schiede); Guatemata, Volcan de Agua at 14,000 feet 
(Hartweg). Hb. Kew. 
[The RapaTeace# are a small order comprising six genera and about twenty species, 
restricted to Tropical America and ranging from Brazil to the border of Venezuela; 
and the FLAGELLARIE# are a small order of three genera and about eight species, natives 
of the warmer parts of the Old World. ] 
Order CL. JUNCACE. 
Juncacee, Benth. et Hook. Gen. Plant. iii. p. 861. 
Including the peculiarly Australian tribes Xerotee and Calectasiex, this order 
numbers fourteen genera and about 200 species. 
1. JUNCUS. 
Juncus, Linn. Gen. Plant. n. 437, pro parte; Benth. et Hook. Gen. Plant. iii. p. 867. — 
Nearly 200 species have been described, but many of them are spurious, and Bentham 
and Hooker estimate that there is probably not more than half that number of distinct 
