112 XXX. RUTACE^. [Zanthoxylum 



purposes, is used in a collective sense, and appears to belong to two 

 or more species of the genus. 



2. Z. melanacanthum Planch, ex Oliv. Ic, p. 305. 



GoLUXGO Alto. — A small young tree, 4 ft. high ; with foliage, but 

 without either flowers or fruit ; forests of Serra de Alta Queta. No. 4526. 

 A tree 30 ft. high ; branches erect -spreading ; crown lax ; leaflets mem- 

 branous ; flowers greenish-yellow ; trunk 12 to 20 in, in diam. at the 

 base. In the elevated forests of Sobato de Bumba ; fl. Feb, 1856, 

 No. 4562. A tree, 15 to 25 ft, high ; trunk beset with strong spines, 

 which in old age go off into large tubercles ; flowers whitish-yellowish. 

 In dense very elevated primitive forests near Quilombo, in Sovado de 

 Quilombo Quiacatubia ; male fl, Jan. 1855. Gathered in fr. near 

 Montalagre in Feb. No. 4569. A very elegant tree, 10 to 15 ft. high ; 

 branches erect-spreading, as well as the trunk (6 in. in diam.), beset 

 with short, straight, very acuminate prickles, which turn red at the 

 apex ; leaves 3-7-jugate, crowded towards the tips of the branches and 

 branchlets ; petiole (narrowly) alate-channelled ; leaflets sub-opposite, 

 softly (and thinly) coriaceous, very glossy above, a little paler and 

 rather glossy beneath, densely pellucid-punctate. Flowers tetramerous, 

 dioecious (or polygamous ?), paniculate ; common peduncle compressed, 

 divided into two parts ; remoter branches mostly 4 together, bracteolate 

 at the base, of a rose-red colour. Calyx almost flat, 4-parted ; segments 

 scattered with very minute red dots, otherwise green. Petals 4, ovate- 

 oblong, alternate wdth the calyx-segments, inserted at the external base 

 of the tetragonal thick disk, slightly imbricate in aestivation, of a pale 

 sulphur colour, recurved-patent during the time of flowering. Sta- 

 mens 4, inserted with the petals and alternate with them ; filaments 

 flattened from the base, gradually narrowing upwards, as long as the 

 petals ; anthers elliptical, introrse, 2-celled, pale yellow, longitudinally 

 dehiscing. Ovary rudimentary ?, conical, seated on a gynophore or 

 thick elevated tetragonal (angles remarkably truncate) disk, ter- 

 minated by a short style. In the very shady primitive forests of 

 Sobato de Mussengue, rather rare ; male fl. beginning of Dec. 1855. 

 No. 4570. A very elegant tree ; in elevated forests amongst the 

 mountains of the eastern Queta, fr. June 1850. No. 4571. A tall tree, 

 with remarkably good yellowish wood, petiole gibbous at the base. 

 Name " Ptio Pacoballa." Bango, in forests, male flower-buds 11 June 

 1855. A poor specimen probably referable to this species. No. 4619. 



The next two Nos. appear to differ from this species, but to be 

 near to it ; the specimens are without flowers or fruits : — 



GoLUNGO Alto. — A small tree, 10 to 15 ft. high ; trunk, branches 

 and petioles bristling with very acute prickles. At the same time a 

 tree of the same, 80 ft, high and laden with ripe fruits, was seen. In 

 shady situations, near Ponte de Luis Somoes, at the base of the moun- 

 tains of Serra de Alta Queta, July 1855, No, 4566- An elegant tree, 

 12 to 15 ft, high ; branches erect-spreading, as well as the petioles 

 rigidly prickly ; leaves pellucid-punctate. In dense forests, at the 

 banks of the river Delamboa, Dec. 1855. No, 4567- 



3. Z. nitens Hiern, sp. n. 



A small tree; branches rather erect, glabrate or nearly so, 

 densely aculeate with straight or slightly recui'ving acute prickles, 

 which range up to | in. in length; leaves alternate, exstipulate, 

 impari-pinnate, 4 5-jugate, glabrous, 6 to 11 in. long; petiole 1| 

 to 3 in. long, as well as its continuation between the pairs of 



