8 CIY. NYCTAGINEE (BAKER AND wriGHT). [| Boerhaavia. 
3900 ft., Brown, 89! British East Africa: Makindu & Kibwezi, Powell, 4! 
Kibasi, Powell, 20! 
Lower Guinea. Angola: Ambriz, Wonteiro! Chella Mountains, Johnston / 
Loando, Gossweiler, 290! Vogelfontein, Baum, 38! German South-west Africa 
Amboland, Rautanen, 80! 314! 
Mozamb,. Dist. German East Africa: Usambara; Umba Valley, Smith ! 
Usagara: Robeho Mountains, 4700 ft., Speke & Grant! Portuguese East Africa : 
Lower Zambesi ; Tete, Kirk ! Lake Nyasa, Johnson, 395! British Central Africa: 
Nyasaland; Shire Valley, Waller! Upper Shire River at Fort Johnston, Sco/¢- 
Elliot, 8436! Ngamiland; Lake River, Lugard, 14! Kwebe Hills, 3300 ft., Mrs. 
Lugard, 21! Bechuanaland: near Palapye, 3000 ft., Lugard, 276! 
Also in South Africa. 
10. B. squarrosa, Heimerl in Bull. Herb. Boiss. iv. 813. Stem 
suffruticose, white, at first finely pubescent, divaricately branched 
upwards. Leaves petioled, ovate, 4-1 in. long, moderately thick, grey- 
green, subentire, subglabrous, the lower obtuse, the upper subacute. 
Umbels 3-5-flowered ; pedicels capillary, 6 lin. long. Perianth glabrous, 
3 lin. long; upper part between campanulate and funnel-shaped ; lower 
persistent part oblong-clavate, 3 lin. long, with 5 viscous ribs. Stamens 
3, about as long as the perianth. 
Wile Land. Somaliland, Keller. 
Lower Guinea. German South-west Africa: Great Namaqualand; Reho- 
both, Fleck, 241a. 
3. PISONIA, Linn. ; Benth. et Hook. f. Gen. PI. iii. 9, 
Flowers polygamo-dicecious. Male perianth funnel-shaped with short 
spreading deltoid lobes. Stamens 5-10, exserted; filaments unequal, 
filiform, united at the base; anthers globose or oblong. Female peri- 
anth longer and narrower, swollen at the base; stamens rudimentary ; 
ovary sessile, elongated ; style exserted, usually lateral; stigma bifid or 
multifid. Fruit surrounded by the hardened clavate pentagonal peri- 
anth, which often has a row of small spreading glandular bristles on 
each rib ; achene similar in shape to the hardened part of the perianth 
and nearly or quite as long.—Climbing or erect shrubs or trees, some- 
times spiny. Leavesalternate or opposite, simple, quite entire. Flowers 
small, greenish, in dense or lax corymbs. 
Species about 30, cosmopolitan in the tropics, chiefly American, 4 in Mauritius. 
1, P. aculeata, Linn. Sp. Pl. ed. i. 1026. A climbing shrub, with 
slender terete stems, armed with large axillary spines. Leaves petioled, 
oblong, acute, glabrous, subcoriaceous. Male flowers in dense peduncled 
axillary corymbs ; pedicels very short. Perianth pubescent, 1 lin. long. 
Stamens 6-8, exserted. Female flowers in very lax panicles; pedicels 
at least 1 in, long. Perianth tubular-campanulate, in fruit clavate, 
Y lin. long, armed with 5 rows of hard gland-tipped bristles —Lam. Il. 
t. 861; Wight, Ic. tt. 1763-4; Choisy in DC. Prodr. xiii. ii. 440; 
