362 CII, LABIAT# (BAKER). [ Acrocephalus. 
small. Corolla protruding } in. from the throat of the calyx ; lips very 
small. Stamens exserted. 
Lower Guinea. Angola: Malange, Mechow, 431. 
25. A, dissitifolius, Buker. Perennial. Stem erect, 2-3 ft. long, 
slightly pubescent upwards. Leaves distant, opposite, lanceolate, nearly 
entire, subsessile, 2-3 in. long, much narrowed to the base, obscurely 
pubescent. Heads few, corymbose, globose, } in. diam.; basal bracts 
ovate or lanceolate, entirely green; flower-bracts purplish, orbicular- 
cuneate, slightly hairy, membranous, } in. long and broad. Flower- 
calyx hairy, shorter than the bract. Corolla under } in. long. 
Lower Guinea. Angola: province of Huilla, Welwitsch, 5611! 
26. A. mechowianus, Briquet in Engl. Jahrb. xix. 168. Stem 
robust, branched ; internodes very long; branches pubescent. Leaves 
very shortly petioled, lanceolate, 3-4 in. long, 3-1 in. broad, acuminate, 
narrowed to the base, minutely crenate, rather scabrous above, paler 
and pubescent below, with close raised veins. Heads very numerous, 
corymbose, depresso-globose, 4-3 in. diam. ; basal bracts ovate-lanceolate, 
4-1 in. long, green, rugose, clothed with white tomentum towards the 
base. Flower-calyx } in. long; lobes very small. Corolla protruding 
zz in. from the throat of the calyx; lips } lin. long. Stamens 
exserted. 
Lower Guinea. Angola: Malange, Mechow, 444. 
27. A. Welwitschii, Briquet in Engl. Jahrb. xix. 169. Perennial. 
Stems tall, much-branched, thinly clothed with short spreading bristly 
hairs. Leaves distant, small, spreading, lanceolate, sessile, obscurely 
crenate, hairy on both sides. Heads many in a corymb at the end of 
the branches, globose, } in. diam.; basal bracts small, green, ovate or 
lanceolate ; flower-bracts membranous, pale green, orbicular, 4 in. long. 
Calyx densely hairy, as long as the bract. Corolla twice as long as the 
calyx. 
Lower Guinea. Angola: province of Pungo Andongo, Welwitsch, 5549 ! 
28. A. sericeus, Briquet in Engl. Jahrb. xix. 170. Perennial. 
Stems stiffly erect, much-branched, 14-2 ft. or more long, densely 
pubescent. Leaves congested into whorls, densely pubescent, lanceo- 
late, entire, sessile, 1-3 in. long, narrowed to the base, pubescent on 
both sides. Heads densely corymbose at the end of the branches, 
globose, 4-1 in. diam.; basal bracts lanceolate, entirely green ; flower- 
bracts green, pubescent, orbicular-cuneate, cuspidate, 4 in. long and 
broad. Calyx as long as the bract. Corolla half as long again as the 
calyx; lips short. Style exserted, very shortly bifid. 
Lower Guinea. Angola: province of Huilla, Welwitsch, 5551! 5603! 
_ 29. A. hyptoides, Baker. Perennial. Stems much branched, 
slightly hairy, decumbent. Stem-leaves lanceolate; lower 5-6 in. long; | 
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