ORDER 67. THE MADDER WORTS. 



229 



ORDER LXVII. RUBIACE.E. The Madderworts 



Plants with opposite, sometimes wliorled, entire leaves ; the 

 stipules between the petioles; the calyx adherent to the ovary; 

 zorolla regular, inserted on the calyx tube; 

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

 Dearies 2, united ; with the 2 styles more or ,ess united. 



Analysis of the Genera. 



Leaves whorlcd. Herbs with square steins a 



$ Leaves opposite, with small stipules between the petioles 2 



2 Herbs, with the flowers habitually 4-parted 3 



2 Shrubs or trees d 



3 Fls. twin (always in pairs).. . .b 



3 Flowers single (not twin) c 



a Flowers 5-parted. Fruit twin, 



fleshy, berry-like. Madder. RU'BIA. 

 a Flowers 4-parted. Fruit twin, dry, 



separable nuts. Bedstraw. GA'LIUM. 

 b Two fls. on one ovary. Creeping 



steins. Partridge-berry. MITCHEL'LA. 1 

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

 ing. Fls. axillary, solitary. DIO'DIA. 

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



Fls. axillary, clustered. SPEEMAOO'CE. 

 o Carpels 2, few-seeded. Corolla 



much exserted. Bluett. HOUSTO'NIA. 2 

 c Carpels 2, many-seeded. Cor. scarce 



exserted. Greenhead. O.DENLAN'DIA. 

 d Flowers 4-parted, in globular 



lids. Button-bush. CEPHALAN'THUS. 

 d Fls. 5-parted, cymes radiant 



with scarlet sepals. S. PINCKNE'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. Mitchells repens, whole 

 ed on the corolla. Stigmas 4. Berries 

 composed ot the 2 united ovaries. Jn. 



