366 CII. LABIAT£ (BAKER). [Orthosiphon. — 
+t Leaves with a long petiole, 
Corolla-tube rather longer than the calyx. . 25. O. Schimperi. 
Corolla-tube half as long again as the calyx. 
Calyx finely pubescent. 
Leaves acute . . . . . . 26. O. somalensis, 
Leaves obtuse. . . . . . 27. O. Hildebrandtit. 
Calyx densely hairy . . . . . 28. O. coloratus. 
Corolla-tube twice as long as the calyx, 
Leaves oblong-lanceolate . . . . . 29. O. Johnstonii. 
Leaves ovate, acute. 
Petiole much shorter than the blade. . 80. O. nyasicus. 
Petiole nearly as long as the blade . . 81. O. longipes. 
Leaves ovate, obtuse . : . . . 82. O. australis, 
=2Stamens exserted beyond the lips of the corolla. 
Bracts minute, deciduous, 
Corolla a little longer than the calyx. 
Leaves oblong-lanceolate . . . . . 83. O. Cameront, 
Leaves oblong . . . . . . 84. O. iodocalyz. 
Leaves cordate-ovate . . . . . 85. O. breviflorus. 
Corolla more than twice as long as the calyx. 
Leaves sessile, linear . . . . . 86. O. linearis. 
Leaves petiolate, oblong-lanceolate . . 87. O. liebrechtsianus. 
Upper bracts crowded, persistent. 
Annuals, 
Raceme short . . . . . . . 88. O. schinzianus. 
Raceme long . . . . . . . 89. O. bracteosus. 
Perennials, 
Stems finely pubescent. 
Corolla-tube short : . . . . 40. O. Marquesii. 
Corolla-tube half as long again as the calyx . 41. O. Welwitschit. 
Corolla-tube twice as long as the calyx . . 42. O. Kirkii. 
Stems very hairy . . . . . . 43, O, Elliottii. 
1. O. tuberosus, Briguet in Engl. Jahrb. xix. 172. Perennial. 
Root-fibres wiry, thickened into oblong tubers. Stems tufted, short, 
erect, simple, slender, densely pubescent. Leaves small, sessile, entire, 
oblong or lanceolate, pubescent on both sides. Whorls 2-flowered, 
forming a lax, terminal raceme; bracts minute; pedicels pubescent, 
x in. long. Calyx pubescent, } in. long; tube campanulate; upper 
tooth small, ovate, shorter than the tube; lateral and lower small 
cusps. Corolla-tube twice as long as the calyx; lobes small. Stamens 
not exserted 
Lower Guinea. Angola: province of Huilla, Welwitsch, 5474! 
2. O. tenuiflorus, Benth. in DC. Prod. xii. 50. A low much- 
branched perennial, with woody main stems and slender pubescent 
branchlets. Leaves sessile or shortly petioled, firm, small, narrow, 
obovate-cuneate, crenate, pubescent. Whorls few-flowered, forming lax 
terminal racemes; bracts minute; pedicels shorter than the calyx, 
pubescent like the rhachis. Fruit-calyx 1 in, Jong; tube campanulate, 
strongly ribbed ; upper tooth orbicular, shorter than the tube; lateral 
teeth small cusps ; lower large cusps. Corolla white, more than twice as 
