34 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Calyx segments united to the middle or higher. 



Leaves with translucent glands; ovary deeply lobate, the cells 

 2-ovulate RUTACEAE. 



Leaves without translucent glands ; ovary entire or scarcely lobate. 

 Leaves pinnate MELLA.CEAE. 



Leaves simple. 



Ovary 3-celled ; anthers longitudinally dehiscent. Flowers 

 white, showy ; pubescence of branched hairs. 



STYRACACEAE. 

 Ovary with 4 or more cells ; anthers dehiscent by apical pores. 



ERICACEAE. 

 AA. Perfect stamens as many as the corolla lobes and alternate ^^ath them, 

 or less numerous. 

 B. Perfect stamens 3 or more, as many as the corolla lobes ; corolla usually 

 regular. 

 C. Ovary simple and of 1 or 2 cells, or the ovaries 2 and distinct. 

 D. Ovules 2 to 4 in the whole ovary. 

 Leaves opposite or verticillate. 



Style stigmatose only below the apex; corolla lobes contorted in 

 bud. Ovary 2-celled or the ovaries 2 and distinct; leaves 



entire; juice usually milky APOCYNACEAE. 



Style stigmatose at the apex or between the lobes; corolla lobes 

 imbricate or valvate. 



Leaves stipulate; style simple LOGANIACEAE. 



Leaves estipulate; style with 1 or 2 stigmas-VERBENACEAE. 

 Leaves alternate. 



Corolla valvate or plicate in bud. 

 Ovules erect; stigmas usually 2. Fruit a capsule. 



CONVOLVTJLACEAE. 

 Ovules pendent ; stigma 1. 

 Leaves compound; fruit a legume; plants often armed with 



spines MIMOSACEAE. 



Leaves simple ; fruit not a legume ; plants unarmed. 



ICACINACEAE. 

 Corolla imbricate in bud. 



Style stigmatose only below the apex ; stigma 1. Leaves entire ; 



juice usually milky APOCYNACEAE. 



Style stigmatose at the apex; stigmas 2. Leaves simple. 



Ovary 1-celled HYDROPHYLLACEAE. 



Ovary 2-celled BORAGINACEAE. 



DD. Ovules more than 4 in the whole ovar5\ 



Fruit a legume; leaves compound. Plants often armed with spines. 



MIMOSACEAE. 

 Fruit not a legume ; leaves simple. 

 Ovaries usually 2 and distinct; juice milky. Plants often 

 scandent; leaves entire. 



Styles separate almost to the apex ASCLEPIADACEAE. 



Styles separate only at the base, or completely united. 



APOCYNACEAE. 

 Ovary 1, entire or slightly lobate; juice not milky. Leaves simple. 



Leaves all opposite LOGANIACEAE. 



Leaves alternate, or only the lowest opposite. 

 St.vle bind HYDROPHYLLACEAE. 



