22 Karl M. Wiegand and Arthur J. Eames 



page 

 /;. Leaves not punctate, simple; stamens 12-many. 



i. Plants twining Menispermaceae 218 



i. Plants neither twining nor climbing. 



j. Flowers hypogynous Magnoliaceae 217 



j. Flowers perigynous Rosaceae 241 



g. Pistil 1. 



h. Stamens 15 or more Tiliaceae 297 



h. Stamens less than 15. 



i. Style 1 (often several stigmas or branches) or none. 

 /. Anthers opening by apical valves; leaves or twigs usually 



more or less spiny Berberis 219 



j. Anthers ordinary, or opening by terminal valveless pores. 



k. Ovary 1-celled Leguminosae 270 



k. Ovary 2-8-celled. 



/. Flowers irregular Hippocastanaceae 294 



/. Flowers regular or nearly so. 



m. Leaves rusty-tomentose beneath ; anthers opening by 



terminal pores Ledum 333 



m. Leaves not tomentose; anthers opening longitudi- 

 nally. 

 n. Stamens opposite the petals. 



o. Petals valvate; plants climbing Vitaceae 296 



o. Petals involute; plants erect Riiamnaceae 295 



ii. Stamens alternate with the petals. 



o. Plant a vine Cclastrus 292 



o. Plant not a vine. 



p. Leaves opposite, simple Evonymus 292 



p. Leaves alternate. 



q. Leaves pinnate ; fruit a samara. 



SlMARUBACEAE 286 



q. Leaves simple ; fruit a berry. 



Aquifoliaceae 291 

 ;'. Styles 2-3. 

 j. Leaves opposite. 



k. Leaves simple ; fruit a samara Aceraceae 293 



k. Leaves 3-foliolate ; fruit a bladdery pod. 



Staphyleaceae 292 

 ./. Leaves alternate. 



k. Leaves compound; summer-flowering. .. . Anacardiaceae 290 

 k. Leaves simple ; petals strap-shaped ; autumn-flowering. 



, Hamamelidaceae 241 



c. Corolla gamopetalous. 

 /. Stamens (fertile) 2-4. 



g. Ovary 4-celled, deeply 4-lobed ; stems mostly 4-angled. 



Labiatae 354 

 g. Ovary 1-celled (see also 3d g). 



h. Plants parasitic, not green Orobanchaceae 376 



h. Plants not parasitic, green. 



i. Flowers regular or nearly so Gentianaceae 341 



i. Flowers conspicuously irregular. 



j. Stamens 2 Lentibulariaceae 377 



j. Stamens 4, didynamous Phrymaceae 379 



g. Ovary 2-4-celled, not deeply lobed. 



h. Plants parasitic, not green, twining Cuscuta (in part) 347 



h. Plants slightly or not at all parasitic, green, not twining. 



t. Flowers scarious, greenish, in dense spikes. . Plantaginaceae 379 



