20 NATURAL HISTORY OF PLANT'S. 
Stamens 4 included. Gynæceum of Oxybaphus. Fruit clothed by 
hardened base of calyx ; wings 2, marginally dentate, spinulose after- 
wards reflexed, so as to form an exterior cell, containing 2 series of 
vertical capitate-glandular tubercles. Seed of Oxybaphus ; embryo 
folded.—A herb; leaves opposite; flowers 3-nate, opposite lobes of 
gamophyllous 3-fid involucre (Warm and Western America). See p. 6. 
8. Boerhaavia L.—Calyx 2-partite to middle ; upper part infundi- 
buliform or campanulate petaloid, apex 5-lobed, deciduous ; lower 
part cylindrical or obconical, persisting round the fruit, indurated 
(virescent or nigrescent), afterwards sometimes slightly gibbous, 
(Senkenbergia). Stamens 1-5 connate at the base, often exserted. 
Germen nearly of Mirabilis ; style erect, sometimes longitudinally sul- 
cate at back ; apex thickened, stigmatiferous. Fruit and seed nearly 
of Oxybaphus ; embryo usually conduplicate.—Herbs annual or peren- 
nial, or frutescent at base; leaves opposite; flowers (small, insig- 
nificant) in simple or ramified spikes, or generally in cymes; cymes 
regular or 1-lateral, rarely solitary or with few flowers, or reduced to 
1; bracts small, not coloured (47 warm regions of the Globe). See p.7. 
9. Abronia J.—Calyx hypocrateriform ; tube narrow, more or less 
inflated at base; limb open, sometimes oblique, 5-lobed deciduous. 
Stamens 5, included, adnate to base of perianth. Germen and ovule of 
Mirabilis ; style subelavate to stigmatiferous apex. Fruit clothed 
with base of 5-agonal costate calyx, which is dilated into from 3-5 
wings more or less membranous-venose. Seed of A/irabilis ; second 
(interior) cotyledon of subcontorted or conduplicate embryo, abortive. 
—Creeping herbs; leaves opposite, unequal long-petiolate ; flowers, 
glomerules, falsely capitate with involucre; usually 5-phyllus, inserted 
at the summit of the usually elongated peduncle (orth Temperate 
America). See p. 8. 
10. Pisonia PLum.—F lowers dicecious or polygamous ; calyx often 
coloured, much varied in form, subovoid, campanulate, clavate, or 
tubular (in the female flowers often longer and more tubular) ; teeth 
4—6, oftener 5, usually short valvate, or induplicate valvate, more 
rarely subreduplicate. Stamens 5-10, or more rarely 10-30-40 ; 
filaments free at the base or slightly connate, usually unequal, either 
