KEY. 197 



the base, as if stalked ; lateral lobes acute. Herbs decum- 

 bent at the base. Leaves rounded or cordate, crenate- 

 toothed, upper ones sometimes clasping. Flowers purple, in 

 axillary, whorled clusters. Nutlets 3-sided, with the apex 

 truncate. Lamlum. 



507. (320.) Plants without tendrils 508 



A tendril-bearing, slender vine. Flowers poly- 

 gamous (or monoecious), the fertile with the calyx-tube con- 

 stricted above the ovary. Calyx funnel-bell-shaped, with 5 

 subulate segments. Corolla bell-shaped, deeply 5-parted. 

 Stamens 5, triadelphous ; anthers 3 or 5, contorted, united. 

 Stigmas 3. FloAvers small, yellow, axillary. Ovary with 3 

 parietal placentae. Fruit a small, ovoid, many-seeded berry. 

 Leaves roundish, cordate, 5-lobed, or angled. Tendrils sim- 

 ple. Melothria pendula, L. (807). 



508. Corolla 2-lipped 536 



Corolla regular, or nearly so 509 



509. L Stamens 8-12. Leaves simple 510 



II. Stamens 5 515 



III. Stamens 4 525 



TV. Stamens 3 (rarely 2) 534 



510. Filaments united into a ring or short tube at the 

 base. Anthers linear-oblong, their cells opening lengthwise. 

 Fruit dry or drupe-like, 1- or 4-celled. Shrubs or small trees. 

 Leaves alteraate oil 



Filaments not united. Fruit a berry or berried 

 drupe, crowned with the calyx-teeth. Shrubs or shrubby 

 plants 512 



511. Corolla o-parted. Stamens 10, jointed to the base 

 of the corolla ; filaments united into a short tube at the base. 

 Fruit coriaceous, a sort of dry drupe, 1-celled, mostly 1- 

 seeded. Flowers showy, white, drooping, racemed. 



(422) Styrax. 



Corolla 4-parted. Stamens 8-12, connate into a 



tube at the base. Style thread-form, pubescent. Fruit dry, 



4-winged, the wings equal, or alternately smaller, 1- to 3- 



seeded. Halesia tetraptera, L, 



