258 LABIATA (Brown). [ Orthosiphon. 
The specimens seen appear to be portions broken off the upper part of the plant 
and are 8-9 in. in length, with 2-4 pairs of flowering branches, which are simple 
or again branched. Allied to O. Holubii, but readily distinguished by the much 
more minute pubescence and absence of ciliation on the leaves. 
25. 0. Holubii (N. E. Br.) ; stems (only terminal pieces 7 in. long 
seen) 4-angled, with internodes 1-1} in. long, sprinkled with short 
spreading hairs; leaves (upper only seen) spreading, subsessile, 1-1} in. 
long, 2—4 lin. broad, lanceolate, acute or acuminate, tapering to an 
acute base, but with scarcely any petiole, bearing tufts of small 
leaves in their axils, glabrous above, with spreading pubescence on 
the nerves beneath, ciliate ; inflorescence 4—5 in. long, terminal, 
with about 1 pair of branches at the base; whorls }—1 in. apart, 
2-6-flowered ; bracts small, caducous, about 1 lin. long, }—3 lin. 
broad, ovate, acute ; pedicels 1-1} lin. long, pubescent ; calyx-tube 
1} lin. long, larger in fruit, campanulate, 5-toothed, pubescent with 
simple and gland-tipped hairs outside, puberulous with gland-tipped 
hairs within ; upper tooth 1 lin. long, 14 lin. broad, broadly orbi- 
cular-ovate, obtuse ; lateral and lower teeth unequal, bristle-like, 
pubescent with simple and gland-tipped hairs, the lower pair about 
1 lin. long; corolla pubescent outside and on the lower part within ; 
tube 4—5 lin. long, dilated and compressed in the upper part ; upper» 
lip 24 lin. long, 3-lobed at the apex; middle lobe ? lin. long and 
broad, suborbicular, emarginate at the apex, reflexed at the sides ; 
lateral lobes very small, rounded; lower lip about 2 lin. long, 
broadly elliptic, obtuse, concave; stamens much exserted, sub- 
equal ; upper pair inserted } of the way up the tube, 6—7 lin. long, 
their filaments free, flat, retrorsely ciliate along the lower part of 
one margin; lower pair inserted at the base of the lower lip, 
4} lin. long, their filaments united to the apex, glabrous ; stigma 
abruptly thickened, oblong, obtuse, slightly emarginate. 
Katauart Recion: Eastern Bechuanaland ; Molopo River, Holub ! 
26. 0. Bolusii (N. E. Br.) ; stems probably several from a perennial 
rootstock, 10-13 in. high, obtusely 4-angled, more or less pilose, 
with a pair of short leafy barren branchlets at 2—4 of the nodes ; 
leaves of main stems in 4-5 pairs, 1-2} in. apart, spreading ; 
petiole 1-2 lin. long, sometimes almost wanting in the uppermost 
pair ; blade }-1 in. long, }—} in. broad, elliptic or elliptic-ovate, 
obtuse to broadly rounded at the apex, rounded or broadly cuneate 
at the base, with 3-7 small teeth on each side, mostly towards 
the apex, green and pubescent (but not densely) on both sides ; 
whorls 4-6 in a simple raceme, }—-1} in. apart, 4—10-flowered ; 
bracts very deciduous, not seen; pedicels 14-2 lin. long, pilose ; 
calyx-tube 24-3} lin. long, campanulate, pilose-pubescent outside, 
glabrous within ; corolla-tube about } in. long, its oblique mouth 
forming the 3-lobed upper lip, glabrous ; upper lobe 1} lin. long, 
1} lin. broad, broadly ovate, obtuse ; lateral lobes smaller ; lower 
lip } in. long, concave-elliptic, obtuse ; stamens all exserted much 
