Pretreothamnus.] xcvu. pedalixe.e (stapf). 565 



1. P. rosaceus, Engl. Jahrb. xxxvi. 228, toith figure on p. 

 229. A shrub, 1-i— 4i- ft. high ; young branches 1 lin. thick, densely 

 hairy, older glabrous, reddish-brown, with the bark peeling off in thin 

 flakes. Leaves crowded towards the tips of the branches, obovate- 

 oblong, cuneate at the base, coarsely sinuate-dentate, up to 1 in. long, 

 about h in. broad, rather densely hairy. Pedicels 3-4 lin. long, densely 

 pubescent. Calyx 1A-2 lin. long, densely pubescent. Corolla slightly 

 over 1 in. long, densely glandular-pubescent, excepting the base ; lowest 

 lobe ovate, h in. long, the others short, rotundate ; throat almost f in. 

 wide. Ovary ovoid-ellipsoid, pubescent ; style hairy. 



Wile Land. Somaliland : Boran ; Jeroko, Elleubeck, 2199. 



The fruit of this genus is unknown, but the general appearance of the plant as 

 figured by Engler points to a very close affinity with Ceratotheca or Pretrea, 

 although there seems to be no indication of central spines or lateral horns in the 

 ovary. 



9. PRETREA, J. Gay ; Benth. et Hook. f. Gen. PI. ii. 1059. 



Calyx small, 5-partite ; segments lanceolate. Corolla obliquely 

 eampanulate ; limb oblique, porrect, subbilabiate ; lowest lobe by far 

 the longest. Stamens subdidynamous, inserted low down in the corolla- 

 tube, not conniving ; filaments slender, filiform ; anthers dorsifixed, 

 cells parallel, dehiscing longitudinally. Disc annular, equal. Ovary 

 2-celled ; cells completely divided by a spurious septum ; ovules 2 in 

 each division. Fruit indehiscent, very hard, disc-shaped with 2 conical 

 spines from near the centre ; mesocarp ultimately with 2-4 large 

 cavities. Seeds 2 in each division ; testa delicate. — Perennial, trailing 

 herbs. Leaves deepiy sinuate-dentate to laciniate. Flowers rose- 

 coloured to crimson, solitary in the axils of the leaves, nodding on long 

 slender pedicels. 



Species 1, extending into South Africa. 



1. P. zangaebarica. ./. Gay in Ann. Sc. Nat. l n ser. i. 457. 

 Stems branched, trailing, up to 6 ft. long, more or less hairy. Leaves 

 broad-ovate to elliptic or oblong in outline, deeply sinuate-dentate or 

 laciniate, -^—1 in. long, J-f in. broad, more or less pubescent, densely 

 mealy-glandular and white below ; petiole 2-3 lin. long. Pedicels 1-2 

 in. long. Calyx 2-3 lin. long, pubescent and glandular-mealy. Corolla 

 1-1^ i n- long; lowest lobe |-| in. long. Fruit f— i in. in diam. — DC. 

 Proclr. ix. 256 ; Decne in Ann. Sc. Nat. 5 me ser. hi. 333 ; Klotzsch in 

 Peters, Reise Mossamb. Bot. 188 ; Engl. Pfl. Ost-Afr. C. 865 ; Stapf 

 in Engl. &, Prantl, Pflanzenfam. iv. 3 B. 264, fig. 97, A.B. 98, K. and in 

 Dyer, Fl. Cap. iv. ii. 463 ; Hiern in Cat. Afr. PI. Welw. i. 801. P. boje- 

 riana, Decne in Ducht. E,ev. Bot. i. 517. P. Forbesii, Decne in Ann. 

 Sc. Nat. 5 me ser. iii. 334. P. eriocarpa, Decne I.e. ; Baum, Kunene-Samb. 

 Exped. 372. P. loasafiolia, Klotzsch, I.e. 188 ; Decne in Ann. Sc. Nat. 

 5 me ser. iii. 334. P. artemisice folia, Klotzsch, I.e. 189, t. 31. P. sene- 

 cioides, Klotzsch, I.e. 189, t. 32. Martynia zanguebarica, Lour. Fl. Coch. 

 386. Diceroocu-yum sinuatum, Bojer in Ann. Sc. Nat. 2 me ser. iv. 269, 

 t. 10. 



