218 



THE FLORA. 



Order LXVII. RUBIACE^. The Madderworts. 



Plants with opposite, sometimes wliorled, entire lemes; the 

 stipules between tlie petioles ; the eali/x adherent to the ovary; 

 corolla regular, inserted on the calyz tube ; 

 stamens inserted on the corolla and as many as its lobes ; 

 ovaries 2, united ; with the 2 styles more or less united. 



4.nalysis of the Genera. 



§ Loaves whorled. Herbs with square stems .... a 



§ Leaves oiaposite, with small stipules between the petioles. . . .2 



2 Herbs, with the flowers habitually 4-parted 8 



2 Shrubs or trees .... d 



8'Fls. twin (always in pairs) b 



3 Mowers single (not twin) o 



a Flowers 5-parted. Fruit twin, 



fleshy, berry-like. Madder. Ed'bia. 

 a Flowers 4-parted. Fruit twin, dry, 



separable nuts. Bedstraw. Ga'hum. 

 b Two fls. on one ovary. Creeping 



stems. Partridge-terry. Mitchel'la. 

 c Carpels 2, 1-seeded, both never open- 

 ing. Fls, axillary, solitary. Dio'dia. 

 Carp. 2, 1-seeded, one never opening. 



Fls. axillary, clustered. Spekmaoo'oe. 

 o Carpels 2, few-seeded. Corolla 



niHoh exserted. Bluets. Hoxjsto'nia. 

 c Carpels 2, many-seeded. Cor. searoe 

 exserted. Gh'eenhead. OLDEHLAN'mA, 

 d Flowers 4-parted, in globular 



hds. Bution-tiush. Cephalan'thhs. 

 d Fls. 5-parted, cymes radiant 



with scarlet sepals. S. Pinokne'ya. 



1. MITCHEL'LA. Partiidge-berry. 



Flowers 2 on each double ovary. Ca- 

 lyx 4-parted. Corolla funnel-shaped, 

 hairy withiu. Stamens 4, short, insert- 

 ed on the corolla. Stigmas 4. Berries 

 composed of the 2 united ovaries. Jn. 



Fig. 497. Mitchella repens, wiiole 

 plant, with flowers and fruit a, cross- 

 section of the doubla fruit, slipwing the 

 two ovaries, 



