420 OXX. SANTALACEE (BAKER AND HILL). [ Thesium. 
Welwitschii, Baum in Kunene-Samb. Exped. 230, not of Hiern in Cat. 
Afr. Pl. Welw. i. 938. 
Lower Guinea. Angola: by the River Chitanda, on sandy ground between 
quartz rocks, Baum, 152! 
This species has been wrongly attributed to 7. Welwitschii, Hiern, from which 
it differs very markedly. 
17. T. xerophyticum, 4. W. Hill in Kew Bulletin, 1910, 342. 
Subshrub, 1 ft. or more high; stems numerous, more or less erect, 
stout, grooved, minutely pilose, much-branched ; branches more or less 
horizontal, stout, grooved, minutely pilose, 1-2 in. long. Leaves 
numerous, reduced to subulate or broadly ovate acute scales, $-1 lin. 
long, tips usually brown. Flowers sessile, axillary on the lateral 
branches; bracts triangular-ovate, acute, 3 lin. long, minutely pilose ; 
bracteoles 2, similar to and slightly smaller than the bracts, boat- 
shaped in both cases with dry brown tips. Perianth 4 lin. long; lobes 
+ lin. long, ovate, hooded, hairy outside, margins sinuous: undulate, 
unfolded, tips generally brown. Filament } lin. long; anthers } lin. 
long. Style minute. Fruits ovoid, about 1} lin. long, 1 lin. broad, 
minutely pilose and with ten well-marked ribs. 
Lower Guinea. German South-west Africa: Hereroland; Windhoek, 
Dinter, 270! Hoffmung Farm, Dinter, 964. 
18. T. leucanthum, Gilg in Baum, Kunene-Samb. Exped. 230. 
Low subshrub ; branches erect, springing from thick root, up to 1 ft. 
high, very much branched above; branchlets erect, very smooth with 
deep longitudinal grooves, Leaves absent or almost absent, reduced to 
scales, $ lin. long. Flowers towards the apices of the branches, dis- 
posed in 4-6 lax or more or less dense spikes, sessile, white, enclosed 
with few lanceolate acuminate bracts 3-1 lin. long at the base. Perianth 
33-4 lin. long; lobes about 24 lin. long, linear or narrowly linear, 
subacute, hooded, with few hairs on margins. Anthers about } lin. 
long, carried up to nearly the top of the segments on long filaments. 
Style elongate filiform. 
Lower Guinea, Angola: by the River Chitanda, near Kassinga, 4200 ft.» 
scattered on swampy ground, Baum, 218! 
19. T. brachyanthum, Baker in Kew Bulletin, 1910, 182. Stems 
about 1 ft. long, erect, glabrous, winged towards the base ; branches 
numerous, slender, erect, deeply suleate. Leaves reduced to ovate 
acute scales 1-1} lin. long, membranous and with stout keel. Flowers 
in long lax terminal spikes; bracts and bracteoles ovate, acute, 
1-1} lin. long, membranous, keeled. Perianth about # lin. long; lobes 
z lin. long, elliptic-ovate, subacute, glabrous. Anthers } lin. long. Sty le 
nearly } lin. Jong. Fruit turbinate, 14 lin. long, with prominent ribs 
and transverse reticulations. ; 
Mozamb. Distr. British Central Africa: Nyasaland; Fort Hill, Tanganyik® 
' Plateau, Whyte! 
A distinct-species with bare deeply suleate stems and reduced membranous thickly 
