524 ADDENDA. 
25. Acrocephalus dissitifolius, Baker. Hiern, in Cat. Afr. Pl. 
Welw. i. 856, refers the number on which this is founded to A. cylin- 
draceus, Oliv. 
28. Acrocephalus sericeus, Briguet. Add :— 
Var. feucrioides, Hiern in Cat. Afr. Pl. Welw. i. 857. - A variety approaching 
A. Heudelotii, Briquet. 
Lower Guinea. Angola: Pungo Andongo; Sobato Quibonga and near 
Quilanga, Welwitsch, 5551. 
29. Acrocephalus hyptoides, Baker. The numbers on which this 
was founded are cited by Hiern in Cat. Afr. Pl. Welw. i. 857, under 
A, minor, Briquet. 
33a. Orthosiphon petrensis, Hiern in Cat. Afr. Pl. Welw. i. 859. 
An erect rigid pubescent perennial herb, with stems 1-1} ft. long. 
Stems simple or little branched. Leaves subsessile, narrowly elliptic, 
1-2 in. long, serrulate, obtuse or subacute, cuneate at the base. 
Inflorescence racemese, terminal, simple or branched, 4-6 in. long; 
whorls 4-6-flowered. Calyx campanulate, }-} in. long; upper tooth 
broad, the others small. Corolla 3 in. long; lips very small. Anthers 
and style exserted. 
Lower Guinea. Angola: district of Huila, Welwiflsch, 5494. 
41. Orthosiphon Welwitschii, Zolfe. Add to the varieties 
named var. angolensis, Hiern in Cat. Afr. Pl. Welw. i. 859 (0. adorna 
tus, var. angolensis, Briquet in Eng). Jahrb. xix. 176). 
34a. HBolanthus Geetzei, Giirke in Enyl. Jahrb. xxviii. 467. 
An undershrub. Leaves sessile, lanceolate, 1-2 in. long, subacute, 
rather fleshy, entire or slightly serrate, pubescent on both surfaces. 
Cymes capitate, congested in terminal racemes; bracts oblong, obtuse, 
{-4 in. long, violet, pilose. Calyx 4 in. long, campanulate, pilose. 
Corolla not seen. 
Mozamb, Dist. German East Africa: Uhehe; plateau near Mgololo, 4500 ft., 
Goetze, 762. 
lla. Plectranthus Stuhlmanni, (iirke in Engl. Jahrb. xxvii. 
469. Leaves shortly petioled, broadly lanceolate, 1-3 in. Jong, acute, 
narrowed to the base, crenate-serrate, quite glabrous. Inflorescence 
racemose, lax, 2-4 in. long; whorls 6-flowered ; pedicels } in. long. 
Calyx campanulate, pubescent ; upper tooth broadly deltoid, acuminate, 
the others lanceolate-deltoid. 
Mozamb. Dist. German Eust Africa: Ukami; South Uluguru Mountains at 
Dundumi Brook, Stuhlmann, 9921. 
116. Plectranthus luteus, Giirke in Hngl. Jahrb. XXViil. 468. 
An undershrub. Leaves shortly petioled, lanveolate, 2-4 in. long, 
acute, serrate, narrowed to the base, glabrous on both surfaces. 
Whorls distant, 6-flowered ; pedicels }-} in. long. Calyx } in. long at 
