FLORA OF ADEN . 
85 
XXXI. Boraginctcea. — Leaves as a rule alternate and simple. Sti- 
pules 0. Flowers bisexual, as a rule regular and pentamerous, in unila- 
teral spikes or racemes. Calyx free, persistent, lobes valvate in bud. 
Ovary 2 -celled, each cell with 2 ovules, or 4-celled and each cell with 
1 ovule. Fruit consisting of 4 nutlets. 
XXXII. Convolvulacea . — Leaves alternate. Stipules 0. Flowers 
large, bisexual, regular, pentamerous, sepals distinct, persistent. Fruit 
a berry or capsule ; seeds 2 — 4. 
XXXIII. Solanacece (Lycium). — Leaves alternate or fasciculate. 
Stipules 0. Flowers regular, pentamerous. Calyx gamosepalous. Ovary 
free. Fruit a berry. Seeds many. 
XXXIV. Scrojohulariacece. — Leaves opposite or alternate. Stipules 0. 
Flowers bisexual, irregular, more or less bilabiate. Stamens 2 or 4, in 
the latter case didynamous. Fruit a capsule. Seeds numerous. 
XXXV. Orobanchacea (Cistanche). — Leaves reduced to fleshy scales. 
Flowers zygomorphic Calyx 4-5-lobed. Corolla tubular, 5-lobed. 
Stamens 4, didynamous. Ovary 1 -celled. Capsule 2-valved. Seeds 
numerous. Parasitic plants, destitute of chlorophyll. 
XXXVI. Bignoniacete. — Leaves opposite, compound ; leaflets oppo- 
site. Stipules 0. Flowers bisexual, zygomorphic. Calyx gamosepalous. 
Ovary free, supported by an annular disk. Fruit a capsule. 
XXXVII. Acanthacece. — Leaves opposite. Stipules 0. Flowers 
bisexual, mostly irregular. Ovary free, 2-celled ; style filiform, bifid, 
one branch often obsolete. Capsule loculicidal. Seeds often clothed 
with white elastic hairs, seated on hard curved supports. 
XXXVIII. Verbenacea (Bouchea). — Leaves opposite or sub-opposite. 
Stipules 0. Flowers bisexual, zygomorphic. Calyx gamosepalous, per- 
sistent, at length splitting longitudinally to the base, lobes 5, imbricate. 
Corolla with 5 subequal lobes. Stamens 4, didynamous. Ovary 
2-celled, 1-2 ovules in each cell. 
XXXIX. Labiata. — Mostly aromatic. Branches usually 4-sided. 
Leaves opposite or whorled. Stipules 0. Flowers bilabiate. Calyx 
persistent. Corolla-lobes imbricate in bud. Stamens didynamous, the 
upper 2 sometimes imperfect or wanting. Ovary free, usually 4-lobed,, 
supported by the annular disk. Fruit of 4 one-seeded nutlets . 
III. — Monochlamyde.®. 
Flowers frequently unisexual. Perianth as a rule simple. Barely a 
distinct calyx and corolla. 
XL. Nyctaginacea (Boerhaavia). — Leaves opposite, entire. Stipules 
0. Flowers small, bisexual. Perianth small petaloid. Stamens 1, or 25 
