82 
FLORA OF ADEN. 
numerous, on a kypogynous disk. Carpels connate into a 1-celled ovary, 
with 2-6 parietal placentas. Seeds numerous, reniform ; endosperm 0. 
V. Polygalacece . — Leaves alternate, simple, entire ; stipules 0. Flowers 
bisexual, irregular ; sepals 5 ; petals 3. Stamens 8 ; filaments united 
into a cleft sheath ; anthers opening by pores. 
VI. Caryophyllacece . — Leaves opposite, entire ; stipules 0 or mem- 
branous. Petals, sepals, and stamens 5 ; stamens in 2 whorls. Ovary 
2- 9 3- , or 5-merous, unilocular. Fruit usually a capsule. 
VII. Portulacacece .— Fleshy herbs. Flowers surrounded by silvery 
hairs and an involucre. Sepals 2 ; petals 4. Stamens 8. Style 4-fid. 
Fruit a capsule. 
VIII. Malvaceae . — Leaves alternate, stipulate, usually palminerved. 
Flowers bisexual, regular, with or without involucral bracts. Sepals 5, 
valvate, more or less connate. Petals 5, base adnate to staminal column, 
contorted in bud. Stamens numerous ; filaments variously connate 
anthers 1-celled. 
IX. Sterculiacece . — Leaves alternate, mostly stipulate. Sepals 5, val- 
vate, more or less connate. Petals 5 or none. Stamens monadelphous. 
Fruit a dehiscent capsule or several distinct carpels. 
X. Tiliacece . — Leaves alternate, simple ; stipules deciduous. Flowers 
regular, bisexual. Sepals 5, valvate in bud. Stamens numerous ; 
anthers 2-celled. Ovary 2-10-celled. 
B. — Disciflorce. 
Thalamus expanded within the calyx into a disk, free or adnate tO‘ 
calyx or to ovary. Stamens arising from the disk. Ovary usually 
superior, and placentation axile. 
XI. ZygopliyUace<z."— Leaves opposite, 1-3-foliate or pinnate ; stipules- 
in pairs. Flowers bisexual ; sepals and petals 5 or 4 ; disk annular, 
fleshy. Stamens not more than 10. Fruit 5-angled, of 5-12 winged or 
spinous or tuberculate indehiscent cocci. 
XII. Geraniacece . — (Erodium) Leaves simple; stipules large. Sepals 5, 
imbricate. Petals 5, imbricate, with alternating glands. Stamens 5, 
alternating with 5 staminodes. Carpels stipitate, trigonous. 
XIII. Mtliacece . — Leaves alternate, pinnate ; no stipules. Flowers re- 
gular in cymose panicles. Calyx small, 5-6-cleft. Petals 5-6. Stamens 
twice the number of petals ; filaments united into a tube. Disk between 
stamens and ovary. 
XIV. Buneracece. — Resinous. Leaves alternate, imparipinnate, some- 
times l-foliate. Flowers small, regular. Calyx 3-5-lobed. Petals 3-5. 
