404 Transactions of the Boyal Society of South Africa. 
I consider this structure to be principally a contrivance for the 
protection of the green tissue against the destructive action of too severe 
sunlight, as explained more fully in another paper." 
GEEANIACE^. 
Pelargonium munitum, Burchell, Trav., vol. i., p. 225. 
As the specimens on which Burchell founded this species were lost 
in the parcel which he despatched to Capetown before reaching the 
Eoggeveld, Harvey (Flor. Cap., i., 308) referred the plant to the insuffi- 
ciently known species. It is therefore advisable to complete the brief 
description given by Burchell. 
Shrubby, thick-stemmed, 2 to 3 feet high, with a few stout branches, 
covered with the rigid, persistent inflorescences. Leaves bi-pinnatifid, 
appearing in winter. Flowers in dichotomously branched panicles, each 
umbel formed of 7 to 9 flowers. Sepals equal, broadly lanceolate with 
a membranous margin, all reflexed, the tube equal in length to the 
sepals. Petals subequal, the 2 upper ones very little longer and broader 
than the others, marked with dark pink stripes near the narrowly eared 
base; the upper petals 9 mm. long, the others 7 or 8 mm. ; stamens 5. 
The plant is fairly common on rocky hills of the South- Western 
Karroo (Prince Albert Eoad, Laingsburg, eastern side of Hex Eiver Pass), 
flowering in spring. Marloth, No. 4387. (See figure in Marloth, Das 
Kapland," p. 323.) 
CKASSULACE^. 
Crassula alstonii, n. spec. (Sect. Sphceritis.) 
Planta sterilis globosa, foliis valde carnosis, sub-hemisphsericis, concavis, 
obtusis, dense aggregatis, squamis setiformibus brevibus, dense obtectis. 
Inflorescentia longiuscule pedunculata, cymosa, cymis 3- to 5-floratis, 
glomeratis vel breviter stipitatis. Flores albi, sepalis ovatis, pilosis, 
petalis liberis, lanceolatis, acutis, conniventibus, apice recurvis, sepalis 
duplo longioribus. SquamaB sessiles, cuneatse, apice emarginatse. 
The plant forms globular bodies, in shape somewhat similar to the 
more widely spread Crassula columnaris, but easily distinguished from 
that plant by the canescent outer surface of the leaves, which is of the 
* Ber. Deutsch. Bot. Ges., xxvii., p. 3G2, 1909. 
