Key. 



ii 



Ovary and pod 2-celled by the meeting of 2 parietal placentae. Calyx 

 and corolla more or less 2-lipped. Trees or woody climbers. 



BIGNONIACE.<E, page 107. 



Ovary and pod 2-celled; placentae axillary; seeds mostly few on 



hooked projections. ACANTHACE^:, page 108. 



Ovary 2-celled; placentae axillary, ovules mostly numerous, not on 



hooked projections. SCROPHULARIACE^E, page 103. 



Corolla regular. 



Ovaries 2, united only at the top to a fleshy disk ; stamens monadel- 

 phous; pollen in horny masses. ASCLEPIADACE^E, page 91. 



Ovary i. 



Deeply 4-lobed ; chiefly rough, hairy herbs. 



BORAGINACE/E, page 96. 



Entire, i-celled, with 2 parietal placentae (sometimes appearing 

 2-celled by union of placentae); usually hairy herbs with 

 toothed, lobed, or divided leaves. 



HYDROPHYLLACE^, page 95. 

 2-celled; stamens 2-4, ovules borne on hooked projections. 



ACANTHACE^;, page 108. 

 2-celled; stamens 4; flowers in spikes; chiefly stemless herbs. 



PLANTAGINACE^E, page 109. 



a-celled; stamens 2; trees or shrubs. OLEACE^E, page 90. 



3-celled; style 3-lobed; corolla lobes 5; stamens 5. 



POLEMONIACE^:, page 94. 



2-4-celled; 1-2 ovules in each cell; twining or slender trailing 



herbs; leaves alternate. CONVOLVULACE^:, page 92. 



2-4-celled, with i erect ovule in each cell; style slender, stigma 



mostly 2-lobed, stamens 4. VERBENACE/E, page 98. 



2-celled (rarely 3-5-celled) ; many ovules on axillary placentae. 



SOLANACE^E, page 101. 



