26 ANALYTICAL KEY. 



C Stamens as many as the lobes of the corolla and alternate with them, or fewer. 



1. Ovary adherent to the calyx-tube (inferior). 



Tendril-bearing herbs : anthers often united. . . Cucurbitace;e, 186 

 Tendrils none. 



Stamens united by their anthers into a ring or tube. 



Flowers in an involucrate head Composite, 215 



Flowers separate, not involucrate: corolla irregular. Lobeliace^e, 282 

 Stamens separate, free from the corolla or nearly so, as 



many as its lobes : stipules none : juice milky. Campanulace.e, 285 

 Stamens separate, inserted on the corolla. 



One to three, always fewer than lobes of the corolla. Valerianace.e, 213 

 Four or five : leaves opposite or whorled. 



Flowers in a dense head, with an involucre : no stipules. Dipsace^e, 215 

 Flowers if in heads not involucrate. 



Leaves whorled and without stipules. Rubiace^e 208 

 Leaves opposite or whorled, and with stipules. > 

 Leaves opposite without stipules (but some- 

 times with appendages to the petioles imitat- 

 ing them) Caprifoliace;e, 202 



2. Ovary free from the calyx (superior). 

 * Corolla irregular: stamens (with anthers) 4 and didynamous, or only 2. 



Ovules and seeds solitary in the (1-4) cells. 



Ovary 4-lobed, the style rising from between the lobes. Labiatve, 341 



Ovary not lobed, the style from its apex. . . . Verbenace^:, 339 

 Ovules numerous or at least as many as 2 in each cell. 

 Ovary and pod 1 -celled, 



With a free central placenta : stamens 2 : aquatics. Lentibulace^;, 317 

 With 2 or more parietal very many-seeded placentae : 



stamens 4 Orobanchace.e, 322 



Ovary and fruit more or less 4 - 5-celled. Martynia, ) Bignoniace^e 320 

 Ovary and pod 2-celled, but the 2 placenta} parietal. ' 

 Ovary and pod 2-celled : placentas in the axis. 



Seeds rarely few, not on hooks, with albumen. Scrophulariace^e, 324 

 Seeds few, borne on hook-like or other projections 



of the placentae : no albumen. . . . Acanthace^e, 338 



* * Corolla somewhat irregular : stamens (ivith anthers) 5. 



Stamens free from the corolla : anthers with their cells 



opening by a hole or chink at the top. Azalea, in Ericaceae, 286 



Stamens inserted on the corolla. 

 Filaments or some of them woolly. Verbascum, in Scrophulariace^;, 324 

 Filaments not woolly Hyoscyamus, in Solanace^e, 380 



