128 XXXIII. BURSERACE^. [Santiriojjsis 



Island of St. Thomas. — A tree, the trunk of which when wounded 

 exudes a balsam. No. 4550. Dec. 1860. No. 6767. Monte Caffe'. 

 The branches of the tree afford the Balsam of St. Thomas ; sent by 

 Sen. Yelloso, Dec. 1860. No. 6768. 



The Balsam of St. Thomas is much sought after in the island on 

 account of its reputation for quickly healing wounds and ulcers. The 

 tree is of moderate height, with pinnate and evergreen leaves. During 

 Welwitsch's short stay in the island, he was unable to discover speci- 

 mens either in flower or fruit. (See Welwitsch, Synopse, p. 48,n. 131.) 



4. ZANHA Hiern, gen. nov. 



Flowers dioecious. Calyx turbinate ; limb 4- or very rarely 

 5-cleft ; lobes valvate in the bud. In the male flowers petals ; 

 stamens 4 (or in the very rare pentamerous calyx 5), exserted, 

 attached at the bottom of the calyx-tube to the internal face of 

 the glandular disk ; filaments cylindrical, equally thick throughout 

 their entire length, irregularly and many times curved ; anthers 

 shortly ovoid-oblong, basifixed, 2-celled ; cells opposite, longitudi- 

 nally dehiscing ; rudiments of the ovary 0. Female flowers and 

 fruit unknown. 



An unarmed tree with resinous bark, alternate branches and 

 pinnate leaves. 



1. Z. golungensis Hiern, sp. n. 



A vast tree, 30 to 40 or 50 ft. high ; trunk 3| ft. in diam. at 

 the base ; branches patent ; branchlets scattered, ascending, densely 

 clothed all over with circular or oblong reddish or brick-coloured 

 verrucose scales, leafless at the time of flowering. Leaves glabrous, 

 7 to 14 in. long ; leaflets 9 to 13, opposite or alternate, oval-oblong, 

 shortly and obtusely acuminate at the apex, unequal at the base, 

 coriaceous, entire, somewhat undulate, rather glossy and of same 

 colour on both surfaces, 1| to 3 in. long by | to 1| in. broad ; 

 petiolule J in. Male flowers greenish, arranged in little dense 

 cymes close to the extremities of the branches ; peduncles ranging 

 up to 1 in. ; calyx green, outside densely scaly-glandular ; lobes 

 erect, ovate-acuminate, bearded at the apex with rather crisp 

 hairs ; glands of the disk green. 



GoLUNGO Alto. — In the primitive forests of Quibolo, on the left 

 bank of the Quibolo rivulet ; male fl. without leaves middle of August 

 1856. No. 4545. Leaves and petioles collected under the tree during 

 a monkey hunt ; August 1856. No. 4546. 



The genus is allied to Ganophyllum Blume, and seems better placed 

 in Burseraceae than in Sapindacese. 



XXXIY. MELIACE^. 



The Meliacese of the Flora of Angola, though not very numerous 

 in species, nevertheless constitute one of the most important 

 Katural Orders, particularly on account of the gigantic size of the 

 trees and the fragrance of the flowers in some genera, and still 



