34 XCVIII, ACANTHACE (BURKILL). [ Tygrophila. 
of its side. Style hairy. Ovary glabrous, 12—16-ovuled.—Polyechma 
odorum, Nees in DC. Prod. xi. 83. 
Upper Guinea. Senegambia: Fonta d’Hiallon, Heudelot, 12 (ex Nees), and 
without precise locality, Heudelot, 807! Sierra Leone: near Mofari, on the River 
Scarcies, Scott-Elliot, 4723 ! 
8. H.acutisepala, Burkill. Stem erect, quadrangular, pubescent. 
Leaves lanceolate, petiolate, scabrid-pubescent on both surfaces, obtuse 
below, acute above, 2 in. long and 7-8 lin. broad ; petioles of the lower 
leaves 3 lin. long. Flowers usually 6 to each node ; bracts oblanceolate, 
pubescent. Calyx-segments linear-setaceous, pubescent, 5 lin. long, 
the posterior a very little longer than the others. Corolla-tube 5-6 lin. 
long, glabrous; lips 5 lin. long, pubescent outside, the lower 3-fid. 
Stamens unequal; the filaments of the upper and lower stamen of 
either side of the flower united at the base. Style hairy. Ovary 
glabrous, about 20-ovuled. Capsule nearly 3 in. long, glabrous. 
Nile Land. Without locality, Petherick ! 
9. H. asteracanthoides, Lindau in Engl. Jahrb. xx. 6. Stem 
quadrangular, pubescent when young especially at the nodes. Leaves 
lanceolate, acute, sessile, tapering slightly to the base, pubescent, 2} in. 
long, 7-8 lin. broad. Flowers in small whorls, usually 6 to each node ; 
bracts Janceolate, pubescent. Calyx-segments equal, 5-6 lin. long, 
pubescent. Corolla-tube 5 lin. long, hairy outside; lips 5-6 lin. long, 
hairy, the lower 3-fid. Stamens of either side of the flower united at 
the base. Ovary glabrous, or with a few glandular hairs. Capsule 
nearly 4 in. long, 12-seeded. 
Nile Land. Erytrea: Osmara, 7500 ft., Schweinfurth & Riva, 2106! Abyssinia: 
between Keren and Gondar, Steudner, 1498, Tigramme, Rohlf & Stecker. 
10. H. senegalensis, 7. Anders. in Jown. Linn. Soc. vii. 22. 
Stems erect, quadrangular, glabrous, fully branched. Leaves linear, 
sessile, entire, acute at the apex and tapering slightly to the base, 
1-1} in. long and 1-2 lin. broad, glabrous, or the uppermost sparingly 
ciliate. Flowers in short spikes at the ends of the branches, 2 at each 
node; bracts linear, ciliate. Calyx-segments linear-subulate, equal, 
ciliate. Corolla-tube 3 lin. long; lips 3 lin. long, the lower with 3 
large teeth. Stamens almost equal; filaments of the upper and lower 
of each side united at the base, all slender. Style hairy. Ovary 
glabrous; seeds numerous.—Physichilus senegalensis, Nees in DC. 
Prod. xi. 81. 
Upper Guinea. Sahara, Guillemin! Senegal, Roger, 32! Richard! Sene- 
gambia, Heudelot, 139! Gambia, Brown-Lester, 12! 
11. H. cerulea, 7. Anders. in Journ. Linn. Soc. vii. 22. Stems 
much branched from the base, obscurely angled, pubescent. Leaves 
narrowly obovate, sessile, pilose, 7-10 lin. long, 2-4 lin. broad. Flowers 
in short terminal spikes, often very small on the lateral branches; 
bracts linear, scarcely equalling the calyx, ciliated. Calyx-segments 
3-4 lin. long, almost filiform, ciliate, the posterior slightly longer and 
