32 



KEY TO THE FAMILIES. 



B. Order Ericales. Flowers regular, bisexual ; sepals 5 ; 

 corolla 5-lobed ; stamens 5, opposite the corolla- 

 lobes and usually inserted on the tube ; ovary 5- 

 celled, with 1 style ; seeds albuminous ; leaves rigid, 



entire ; shrubs (Heath) 



B. Order Primulales. Flowers regular, bisexual ; calyx 

 more or less deeply 4-5-cleft ; corolla 4-5-lobed ; 

 stamens 4-5, opposite the corolla-lobes; ovary 1- 

 celled, with free central placenta, and (in Samolus) 

 half-inferior ; style 1 ; seeds albuminous ; herbs 



(Brookiveed) 



B. Order Plumbaginales. Flowers regular, bisexual ; calyx 

 tubular, 5-toothed ; petals 5, united at least at the 

 base ; stamens 5, opposite the petals ; ovary 1 -celled, 

 with 5 styles, 1-ovuled; seeds albuminous; herbs 



(Sea Lavender) 



B. Order Contortae. Flowers regular ; calyx-lobes and 

 corolla-lobes usually 5, the latter twisted in bud ; 

 stamens 5 or fewer ; ovary 1-2 -celled or of distinct car- 

 pels ; leaves simple, usually opposite, without stipules. 

 C. Carpels completely united in a 1-2-celled ovary ; 

 stigmas 2 ; flowers regular, bisexual. 

 D. Stamens 2, inserted in the corolla-tube but not 

 opposite the lobes ; calyx and corolla 4-6-lobed ; 

 ovary 2-celled, with 1 style ; capsule, berry, or 

 drupe ; leaves usually opposite ; shrubs (Jasmine) 

 D. Stamens as many as corolla-lobes, alternate with 

 them, and inserted on the tube ; seeds albuminous. 

 Calyx 2-5-lobed ; corolla 4-5-lobed ; ovary 2-celled ; 

 style simple or 2-branched ; capsule ; leaves 



opposite ; shrubs or herbs 



Calyx and corolla 4-5-lobed ; ovary 1 -celled, with 2 

 parietal placentas, or completely 2-celled, with 1 

 style : capsule ; leaves opposite or radical ; herbs, 



sometimes aquatic (Centaury) 



C. Ovary of 2 distinct carpels, with 1 united style and 

 stigma ; flowers regular and bisexual ; calyx and 

 corolla 5-lobed ; ovules pendulous, several in each 

 carpel ; stamens 5, alternate with the corolla-lobes ; 

 seeds albuminous ; leaves mostly opposite ; branches 

 usually with milky juice. 

 Stamens free, inserted on the corolla-tube ; pollen 

 powdery ; fruit of 1 or 2 drupes or follicles ; shrubs 



or perennial herbs (Periwinkle Family) 



Stamens connate in a tube round the style, the filaments 

 bearing 5 appendages called the corona ; pollen 

 consolidated into pendulous masses ; fruit of 1 or 2 

 follicles ; seeds usually hair-tufted ; shrubs or 



twining herbs (in Sarcostemma leafless) 



B. Order Tubiflorae. Flowers bisexual, regular or irregular, 



and in the latter case the corolla is 2-lipped ; corolla 



tubular in the lower part, with the stamens inserted 



upon it. 



E. Flowers regular, the limb of the corolla usually spreading 



horizontally ; stamens as many as corolla-lobes. 



F. Fruit separating into 4, rarely 2, 1 -seeded nutlets ; 



calyx and corolla 4-lobed ; stamens 5, opposite 



the corolla-lobes ; ovary 2-celled or spuriously 4- 



celled, with 1-2 ovules in each cell ; style 1, simple 



or branched ; herbs, usually rough-hairy, with 



alternate simple leaves (Heliotrope, Forget-me-not, 



Hound's -tongue 



F. Fruit a berry or capsule ; stamens 5, on the corolla - 

 tube and alternate with the lobes. 

 Fruit a capsule ; calyx of 5 sepals or 5-lobed ; corolla 

 5-angled or 5-lobed ; ovary usually 2-celled, or (in 

 Dichondra) of 2 separate carpel?, with 1-2 basal 

 ovules in each cell ; styles 1 or 2 ; herbs, often 

 twining, with alternate leaves, or (in Cuscuta) a 

 leafless parasite (Bindweed, Dodder) 



Epackidaceae 87 



Primulaceae 



Plumbaginaceae 



Oleaceae 90. 



LOGANIACEAE 91. 



Gentianaceae 92. 



Apocynaceae 93. 



ASCLEPIADACEAE 94. 



Borraginaceae 96. 



COXVOLVULACEAE 95. 



