448 Lxix. RUBiACiLfi. [Olderdcmclia 



fr. beginning of April 1860 ; also in elevated mossy pastures near 

 Humpata, in company with species of Xyris and Isoetcs; fl. and fr. 

 April 1860. No. 3054. 



23. 0. pellucida Hiern, sp. n. 



A tender erect annual herb, herbaceous-green, glaucescent, 

 growing in dense mas.ses ; stem .simple, 2 to 3 in. high, slender, 

 somewhat compressed, quadrangular, hispidulous on the angles ; 

 leaves elhjjtical or somewhat ovate, apiculate not acuminate at 

 the apex, more or less abruptly wedge-shaped at the base, thinly 

 membranous, glabrous or nearly so except the thinly ciliate 

 margin, pellucid-punctate, ^ to 1 in. long by |^ to ^ in. broad ; 

 petiole y^o to i in. long ; stipules multifid, with sub-hyaline fringe- 

 like segments ; flowers mUk-whitish, about | in. long, on very 

 short pedicels 3 to 6 together at the apex of the stem or solitary in 

 the upper axils ; calyx-teeth 4, very loosely surrounding at the 

 base the slender corolla-tube and about half its length, persistent, 

 not accrescent ; corolla-limb quadrifid, its lobes milk-white, 

 obovate, rather obtuse, abruptly acuminate ; anthers sub-exserted ; 

 capsule 2-celled, puberulous. 



HuiLLA. — On the moist sides of streams^on the plateau of Humpata 

 near Empalanca ; fl. and fr. middle of April 1860. No. 5344. 



24. 0. benguellensis Hiern, sp. n. 



An erect glabi-ate shrub, 2 to 4 ft. high, with an Umbellifei'ous 

 habit ; branches mostly opposite, spreading, terete, shining ; 

 branchlets leafy ; leaves sub-linear, somewhat scabrid above, 

 sessile, |^ to 2 in. long, margins revolute along the midi'ib ; 

 stipules sheathing, truncate ; inflorescence terminal, repeatedly 

 branched, corymbose, bracteate, in fruit ranging from 1 to 3 in. in 

 diameter ; ultimate pedicels shorter than or rather exceeding the 

 fruit ; calyx -limb 4-partite, with ovate not accrescent segments ; 

 corolla somewhat exceeding the calyx, quadrifid, with valvate 

 lobes ; style bifid ; fruit campanulate, .slightly compressed, about 

 i in. long, glabrous, 2-celled, loculicidal ; seeds numei-ous, some- 

 what angular. 



MosSAMEDES. — In mountainous rocky places at the banks of the 

 river Maiombo ; in old fr. Oct. 1859. No. 5353. In hilly, bushy, 

 stony places, by the river Maiombo, abundant ; fl.-bud and fr. Oct. 

 1859. No. 5354. 



HuiLLA. — In rather dry thickets between MumpuUa and Nene ; fr. 

 Oct. 1859. No. 5355. 



25. 0. nesaeoides Hiern, sp. n. 



An erect annual herb, 4 to 12 in. high, nearly simple or with 

 suberect or a.scending bi-anches from the base upwards, rather 

 slender ; stem and branches quadrangular, hispidulous ; leaves 

 opposite, elliptical or somewhat lanceolate, mostly narrowed 

 towards both ends, pointed or apiculate at the apex, more or less 

 wedge-shaped at the base, membranous, flat except the narrowly 

 revolute margin, slightly hi.spidulous especially along the nerves 

 beneath, becoming very pale and glaucescent beneath, | to 1| in. 

 long by 1^ to I in. broad ; lateral veins about 4 on each side of the 



