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, 2-2^ in. long, under J in. diam. exclusive of the 

 corollas. Fruit-calyx J in. long ; teeth linear, not longer than the 

 carapanulate tube. Corolla not seen. 



Wile Iband. Unyoro : banks of the Nile, amongst rushes, Speke Sf Grant ! 



2. P. Schweinfurthii, Briquet in Engl. Jahrh. 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 1 j-2 in. long, f-1 in. diam. exclusive 

 of the corollas. Fruit-calyx J- J in. long ; teeth subulate, twice as long 

 as the campanulate tube. Corolla pale blue, glabrous outside ; lower lip 

 J in. long. 



Upper Guinea. Togoland : Krak^e, Krause ! 



ISrile land. British East Africa : Bongo; Dukuttu (Dnggudu), Schweinfurthy 



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, 1-2| in. long, very acute, 

 narrowed to the base, obscurely toothed, green and pubescent on both 

 surfaces. Spike dense, terminal, oblong-conical, 1-1 J 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, J-i in. long. Corolla blue, protruding J-| in. from the throat 

 of the calyx ; lips J- J in. long. Stamens included. 



Soutb Central. Congo Free State : Risobi, near the River Lufongo, Des- 

 camps. 



4. P. StnHlmannii, Gurke in Engl Pfl. Ost-Afr. C. 345. 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. 



xrile Xiand. German East Africa : Karagwe ; Ngaramo district, Stuhlmann, 

 1630. 



5. P. congensis, Gurke in Bull. H&rh. Boies, iv. 819. Stem and 

 branches pubescent. Leaves sessile, lanceolate, acuminate, 2-4 in. long, 

 strongly serrate, glabrous on both surfaces or pubescent on the main 

 veins. Spike cylindrical. Calyx-tube campanulate, glandular-pubescent, 

 ■^^ in. long ; teeth erect, as long as the tube. 



Soutb Central. Congo Free State : Samba, Descamps, 28; Lusambo, on the 

 River Sankuru, Descamps, 27. 



i 



