380 CII. LABIATE (BAKER). [ Pycnostachys. 
1. P. stenostachys, Baker. A perennial, with branched square 
glabrous stems. Leaves distant, linear, sessile, glabrous. Spikes very 
dense, cylindrical, 2-24 in. long, under $ in. diam. exclusive of the 
corollas. Fruit-calyx 4 in. long; teeth linear, not longer than the 
campanulate tube. Corolla not seen. 
Nile Land. Unyoro: banks of the Nile, amongst rushes, Speke & Grant! 
2. P. Schweinfurthii, Briquet in Engl. Jahrb. xix. 191. An erect 
branched perennial, with pale square stems 2 ft. long, pubescent towards 
the top. Leaves distant, linear, spreading, sessile or subsessile, serrate, 
obscurely pubescent beneath, the largest 3-4 in. long, } in. broad at the 
middle. Spikes very dense, finally 14-2 in. long, #-1 in. diam. exclusive 
of the corollas. Fruit-calyx }—-} in. long; teeth subulate, twice as long 
as the campanulate tube. Corolla pale blue, glabrous outside ; lower lip 
} in. long. 
Upper Guinea. Togoland: Krakye, Krause ! 
Wile Land. British East Africa: Bongo; Dukuttu (Duggudu), Schweinfurth, 
2770! 
3. P. Descampsii, Briquet in Bull. Soc. Bot. Belg. xxxvii. 63. A 
tall herb. Stem cylindrical, many-ribbed, pubescent ; internodes long. 
Leaves 5-6 in a whorl, subsessile, linear, 1-24 in. long, very acute, 
narrowed to the base, obscurely toothed, green and pubescent on both 
surfaces. Spike dense, terminal, oblong-conical, 1-14 in. long ; bracts 
linear, as long as the expanded flowers, protruding beyond the buds. 
Tube of flower-calyx campanulate, very small, densely pubescent ; teeth 
subulate, }—} in. long. Corolla blue, protruding 4-4 in. from the throat 
of the calyx; lips }-} in. long. Stamens included. 
South Central. Congo Free State: Risobi, near the River Lufongo, Des- 
camps. 
4. P. Stuhlmannii, Giirke in Engl. Pf. Ost-Afr. C. 349. Stems 
tetragonous, branched, pubescent. Leaves very shortly petioled, 
linear-lanceolate, conspicuously acuminate, narrowed to the base, deeply 
serrate, glabrous on the upper surface except on the ribs, pubescent 
beneath. Spikes short, ovoid. Calyx pubescent ; teeth rather longer 
than the tube, pubescent upwards. 
Nile Land. German East Africa: Karagwe ; Ngaramo district, Stuhlmann, 
1630, 
5. P. congensis, Giirke in Bull. Herb. Boiss. iv. 819. Stem and 
branches pubescent. Leaves sessile, lanceolate, acuminate, 2~4 in. long, 
strongly serrate, glabrous on both surfaces or pubescent on the maiD 
veins. Spike cylindrical. Calyx-tube campanulate, glandular-pubescent, 
z's in. long ; teeth erect, as long as the tube. 
South Central. Congo Free State : Samba, Descamps, 28; Lusamlo, on the 
River Sankuru, Descamps, 27. 
