356 CII. LABIATH# (BAKER). [ Acrocephalus. 
Leaves oblong-lanceolate. 
Leaves sessile or subsessile. 
Leaves entire. . . . . . 31. A. Hensii. 
Leaves distinctly toothed .. . . . 82. A. minor. 
Leaves shortly petioled. 
Stem slightly pilose. . . . . 33. A. elongatus. 
Stem densely clothed with spreading hairs . 34. A. angolensis. 
Leaves oblong . . . . . 35. A. divaricatus. 
Heads in panicled clusters. . . . . . 86. A. paniculatus. 
1. A. monocephalus, Baker. Perennial. Stem slender, flexuose, 
slightly pubescent, 6-8 in. long. Leaves linear, sessile, denticulate, 
spreading, 1-14 in. long, slightly pubescent on both sides. Head single, 
terminal, globose, 14 in. diam.; basal bracts small, ovate, greenish- 
white, with leafy cusps; flower-bracts rhomboid, very hairy, ¢ in. long 
and broad, subacute, green with a pale base. Calyx villous, 4 in. long; 
lips oblong. Corolla twice as long as the calyx; lips short. 
Mozamb. Dist. German East Africa: Lower Plateau, north of Lake Nyasa, 
Thomson ! 
2. A. centratheroides, Baker. Annual. Stem short, pubescent, 
with several long spreading branches. Leaves opposite, lanceolate, 
sessile, dentate, pubescent, 2-3 in. long. Heads sessile at the end of 
the main stem and branches, overtopped by the upper branchlets, 
globose, 4-4 in. diam.; basal bracts ovate or lanceolate, very hairy, 
green ; flower-bracts hairy, green, obovate-cuneate, 4 in. long. Calyx 
as long as the bract. Corolla } in. long; tube slender; limb short. 
Upper Guinea. Lower Niger, Baikie ! 
3. A. galeopsifolius, Baker. Annual. Stems 14-2 ft. long, 
slender, much branched, with a few short spreading hairs. Leaves 
petioled, oblong, acute, crenate, 14-2 in. long, slightly hairy, cuneate at 
the base. Heads globose, }-} in. diam., solitary or 2-3 approximate 
at the end of the branches; basal bracts lanceolate, all green ; flower- 
bracts orbicular-cuneate, membranous, as long as the calyx. Calyx $ in. 
ons 5 lips oblong. Corolla twice as long as the calyx ; lower lip § in. 
ong. 
Mozamb. Dist. Kavala Island, in Lake Tanganyika, Carson! 
4. A. gracilis, Briquet in Engl. Jahrb. xix. 166. Annual. Stems 
erect, much-branched, 1-1} ft. long, finely pubescent. Leaves linear, 
sessile, denticulate, finely pubescent, acute, 1-1} in. long, narrowed to 
the base. Heads solitary at the end of the branches, globose, 4-4 1n- 
diam. ; basal bracts small, ovate, acute, green throughout ; flower-bracts 
orbicular-cuneate, § in. long, with long hairs on the back and edges. 
Calyx as long as the bract ; lips oblong, shorter than the tube. Corolla 
twice as long as the calyx. 
Lower Guinea, Angola, Welwitsch, 5515! 
5. A. succiszfolius, Baker. Perennial. Stems erect, 1-14 ft. 
long, slender, glabrous below, obscurely hairy upwards, bearing about 
