218 THE FLORA. 
Orpen LXVII. RUBIACEH. The Madderworts. 
Plants with opposite, sometimes whorled, entire leaves ; the 
alipules between the petioles; the calya adherent to the ovary; 
corolla regular, inserted on the calyx tube; 
stamens inserted on the corolla and as many as its lobes; 
ovaries 2, united ; with the 2 styles more or less united. 
Analysis of the Genera. 
§ Leaves whorled. Herbs with square stems....a 
§ Leaves opposite, with small stipules between the petioles....2 
2 Herbs, with the flowers habitually 4-parted....8 
2 Shrubs or trees....d 
8 Fis. twin (always in pairs)....D 
8 Flowers single (not twin)....¢ 
= Flowers 5-parted. Fruit twin, 
fleshy, berry-like. Madder. Ru/z1a. 
a Flowers 4-parted. Fruit twin, dry, 
separable nuts. Bedstraw. Ga’LIuM. 
b Two fis. on one ovary. Creeping 
stems. Partridge-berry. MircHEL’La. 1 
e Carpels 2, 1-seeded, both never open- 
ing. Fils. axillary, solitary. Dro’p1a. 
ce Carp. 2, 1-seeded, one never opening. 
FIs. axillary, clustered. SpERmaco’cx. 
e Carpels 2, few-seeded. Corolla 
much exserted. Bluets. Hovusto’nta, 2 
ce Carpels 2, many-seeded. Cor. scarce 
exserted. Greenhead, OLDENLAN’DIA. 
d Flowers 4-parted, in globular 
hids. Button-bush. CEPHALAN’THUS. 
d Fis. 5-parted, cymes radiant 
with scarlet sepals. §S. Prncnwe’/ya. 
1. MITCHEL'LA. Partridge-berry. 
Flowers 2 on each double ovary. Ca- 
lyx 4-parted. Corolla funnel-shaped, — 
hairy within. Stamens 4, short, insert- Fig. 497. Mitchella repens, whole 
ed on the corolla. Stigmas4. Berries Plans with flowers and fruit. a, eross- 
: . section of the double fruit, showing the 
composed of the 2 united ovaries. Jn. — two ovaries, 
