902 cm. PHYTOLAccACEiE. [PJiTjtolacca 



2. P. dioica L. Sp. PL, edit. 2, p. 632 (1762) ; Welw., I.e. 



Pircunia dioica Moq., I.e., p. 30. 



A valuable tree, especially useful for the sake of the dense 

 shade which it affords; the Portuguese call it " Bella sonibra" ; 

 "Welwitsch, I.e., recommended its introduction into Angola, as 

 being a quick grower and well adapted for planting in the public 

 squares, etc. Cultivated about Lisbon ; fr. 1861. Coll. Carp. 863. 



CIV. POLYGONACE^. 



1. OXYGONUM Burch. ; Benth. & Hook. f. Gen. PI. iii. p. 96. 

 Raphanopsis Welw. Apontam. p. 547, sub n. 75 (1859). 

 Diplopyramis Welw., I.e., p. 591. n. 106. 



1. 0. alatum Burch. Trav. i. p. 548. n. 2074 (1822) ; Benth. in 

 Hook. Ic. PI. xiv. p. 14. t. 1321 (1880). 



HuiLLA. — An annual herb, with the habit of a Raphanus, agree- 

 ably acidulous in all parts, tasting like Rumex Acetosella L., edible, 

 divaricately branched from the base, the lower part subscabrid or 

 subpubescent with whitish setulse or papillas directed downwards ; 

 root and base of the stem bloodred-purple ; leaves glancescent, some- 

 what fleshy, lanceolate, more or less deeply incised or even laciniate ; 

 flowers hemaphrodite and male, racemose along an elongated rachis, 

 two together in the axil of each bract ; perianth milk-white, 5-cleft, 

 the two outer segments keeled and mucronate with protracted-hooded 

 keel, the other segments somewhat concave and without a macro ; 

 stamens 8 or very rarely 5 ; filaments dilated and bearded at the base; 

 anthers oblong, bluish ; pollen whitish ; ovary triquetrous, 1 -celled ; 

 style trifid ; stigmas capitate, yellow ; achene triquetrous, enclosed 

 in the fleshy acutely alate-trigonous tube of the perigonium and 

 surmounted with its marcescent limb. On hot and somewhat rocky 

 sands, in places neglected after cultivation, and by roadsides, near 

 Lopollo ; fl. Dec. 1859 and Jan. 1860, fl. and young fr. April and 

 1 May 1860. No. 1755. 



This differs from the type of the species, which was collected near 

 the Asbestos mountains, in having its flowers milk-white instead of 

 flesh-coloured. 



2. 0. cordofanum Dammer in Engl. Nat. Pflanzenfam. iii., la, 

 p. 30 (1893). 



Ceratogonon atriplici/olium Hochst. in Kotschy PI, Nub. 

 Exsicc. n. 117 (U.i., 1841), Raphanopsis sp., Welw., I.e., p. 547. 

 Diplopyramis cethiopiea Welw., I.e., p. 591. n. 106. Ceratogonum 

 Cordofanum Meisn. in DC. Prodr. xiv. p. 39 (1856). C. sinuatum 

 Britten, Journ. Bot. sxxiii. p. 75 {I'^'db), p>artly. 



Ambaca. — An annual, much branched, fully developed herb ; stem 

 decumbent ; branches ascending ; flowers white. In neglected fields 

 and barren plains near N-gombe, plentiful ; fl. and fr. Oct. 1856. 

 No. 1756&. 



PuNGO Andongo. — Flowering racemes seeming terminal when 

 young but really axillary or rather alar, not nodding but the pedicels 

 of the male flowers arching-recurved from the apex after flowering 

 and the fertile flowers even in the fruiting state seated on erect 

 pedicels ; perianth white ; anthers deep clear blue ; fruit resembling 



