272 CXXIIIp. URTICACE (Rendle). [ Pilea. 
linear cystoliths ; leafy only in the upper part and on the branchlets. 
Leaves of a pair sometimes unequal, ovate or elliptic, sometimes 
almost rounded, obtuse to acute or shortly acuminate, base rounded 
to wedge-shaped, margin serrate above the base, triplinerved, the 
lateral nerves reaching to about or a little beyond the middle of the 
leaf, 4-1 in. long, 4-8 lin. wide, toughly membranous, upper face 
when dry dark green and marked with numerous linear cystoliths, 
lower face dull reddish ; petioles slender, 2-5 lin. long. Stipules 
minute, triangular, caducous. Inflorescences in the upper leaf- 
axils, peduncled, generally exceeding the petiole, the male longer 
than the female. Male flowers clustered at the end of the peduncle 
or its forks ; perianth 4-partite, lobes with a subapical mucro ; bud 
nearly 1 lin. in diam. Female flowers more closely crowded than 
the male; median lobe of perianth shortly hooded, exceeding the 
lateral lobes and nearly equal to the achene. Achene brown, com- 
pressed, ovate, barely exceeding 4 lin. in length.—P. rupipendia, 
Wedd. in Ann. Sci. Nat. 4me sér. i. 186, and in DC. Prodr. xvi. i. 128. 
Parietaria urticefolia, Linn. f. Suppl. 434. Urtica rupipendia, Por. 
Encycl. iv. 640. : 
East Africa. Without precise locality, Martin (tide Weddell). 
Also in the Mascarene Islands. 
6. P. Holstii, Lngl. in Glied. Veg. Usambara, 50, and Pil. Ost- 
Afr. C. 163. <A tall glabrous herb, 24 ft. high, moneecious oF 
dicecious (?), sometimes branched. Leaves ovate, acuminate, base 
almost rectangular and entire, margin above base grossly serrate, 
3-nerved, the lateral nerves running to below the apex, leaves of a 
pair subequal or one somewhat larger and longer-stalked than the 
other, generally between 14-3 in. long, and 3 to nearly 2 in. wide, 
thinly membranous when dry, the lower face Jensely covered with 
linear sometimes slightly curved cystoliths ; petiole slender, shorter 
than the leaf, 3-2} in. long. Stipules caducous. Inflorescences 
axillary; male shorter than the petiole and somewhat densely 
paniculate ; flowers shortly stalked ; perianth 4-partite, midveins 
thickened and ending in a short umbo. Female inflorescence about 
equal to or longer than the petiole, laxly paniculate, to about 1} in. 
long ; the flowers aggregated in small cymules on the slender branches ; 
perianth 3-partite, segments about equal, the median very concave, 
in side view oblong, apex somewhat truncate, apiculate, lateral 
segments ovate, subacute ; pedicel half the length of the flower. In 
fruit the median segment reaches just above the middle of the 
achene, and is about twice as long as the lateral segments. Achene 
ovate with a pronounced thinner margin, } lin. long. 
Mozamb. Distr. German East Africa: : , in forest, 
Holst, 2245! Buchwald, 638 ! iui memantine: cape 
