18 General Key to Families 



Page 



1 89B. Stamens as many as the corolla-lobes and alternate with them, or fewer. 

 192A. Fertile stamens 2 or 4, fewer than the corolla-lobes. 

 193A. Herbs; corolla more or less zygomorphic. 

 194 A. Ovary 1-locular. 



195A. Aquatic herbs, the submerged leaves much dissected, with insectivorous bladders; corolla spurred at 



base Fam. 181. Lentibulariaceae, 813 



195B. Terrestrial herbs without insectivorous bladders; corolla not spurred. 



196A. Fruit an indehiscent 1-seeded nutlet, conspicuously reflexed; placentae basal. 



Fam. 184. Phrymaceae, 819 

 196B. Fruit a many-seeded dehiscent pod or capsule, not reflexed; placentae parietal. 



197A. Plants with green leaves; stamens 2-5 Fam. 180. Gesneriaceae, 812 



197B. Plants parasitic, without green leaves; stamens 4 Fam. 179. Orobanchaceae, 810 



194B. Ovary 2- to 5-locular. 



198A. Ovary with a solitary ovule in each locule. 



199A. Ovary deeply 4-lobed consisting of as many nutlets; style 1, cleft at apex Fam. 175. Labiatae, 766 



199B. Ovary not lobed; style 1, entire Fam. 174. Verbenaceae, 762 



198B. Ovary with 2 to many ovules in each locule. 

 200A. Vegetative parts usually with cystoliths; seeds few, each supported by a retinaculum. 



Fam. 182. Acanthaceae, 816 

 200B. Vegetative parts without cystoliths; seeds usually small and many, not supported by a retinaculum. 



201A. Shrubs with alternate leaves; fruit a berry or a drupe Fam. 183. Myoporaceae, 818 



201B. Herbs, rarely trees or shrubs, with alternate, opposite or verticillate leaves; fruit usually a dehiscent 



capsule Fam. 177. Scrophulariaceae, 790 



193B. Trees or shrubs; corolla essentially regular Fam. 166. Oleaceae, 728 



192B. Fertile stamens 4 or 5, as many as the lobes of the nearly actinomorphic corolla. 

 202A. Ovary apparently deeply 4-lobed. 



203A. Leaves opposite Fam. 175. Labiatae, 766 



203B. Leaves alternate Fam. 173. Boraginaceae, 755 



202B. Ovary not 4-lobed. 



204A. Stamens free or nearly free from the corolla. 



205A. Scandent shrubs; style simple, 5-lobed Fam. 123. Icacinaceae, C06 



205B. Erect or ascending shrubs or trees; styles entire or absent. 



206A. Style simple; fruit a capsule; flowers perfect Fam. 159. Ericaceae, 693 



206B. Style absent; fruit a drupe; flowers usually polygamodioecious Fam. 120. Aquifoliaceae, 598 



204B. Stamens epipetalous. 



207 A. Capsule bifid at apex; leaves opposite, with stipules Fam. 167. Loganiaceae, 734 



207B. Capsule not lobed until maturity, or a drupe, sometimes a berry; leaves opposite and exstipulate or 

 alternate. 

 208A. Corolla small and scarious; capsules circumscissile; leaves simple and all radical. 



Fam. 185. Plantaginaceae, 819 

 208B. Corolla not scarious; fruit usually longitudinally dehiscent or sometimes indehiscent. 

 209A. Leaves opposite. 



210A. Woody plants Fam. 174. Verbenaceae, 762 



210B. Herbs Fam. 168. Gentianaceae, 735 



209B. Leaves alternate. 

 211 A. Plants scandent. 



212A. Flowers perfect; fruit usually a capsule, rarely a berry; stigma capitate or bifid. 



Fam. 171. Convolvulaceae, 751 



212B. Flowers unisexual; fruit a drupe; stigma 5-lobed Fam. 123. Icacinaceae, 606 



211B. Plant not scandent. 



213A. Stigmas 3; ovary 3-locular; capsule dehiscent, 3-valved. 



214A. Herbs with pinnatcly divided leaves Fam. 172. Polemoniaceae, 754 



214B. Depressed shrublets or subherbaceous with undivided, entire or serrate leaves. 



Fam. 156. Diapensiaceae, 688 

 213B. Stigmas 1-5; ovary 1- to 5-locuIar (when 3-locular the capsules indehiscent). 

 215A. Ovary 2- or 3-locular; terrestrial plants. 



216A. Ovules many; leaves pubescent, glabrous or spiny, not characteristically scabrid or hispid. 



Fam. 176. Solanaceae, 787 

 216B. Ovules 4; leaves characteristically scabrid or hispid, sometimes glabrous, never spiny. 



Fam. 173. Boraginaceae, 755 

 215B. Ovary 1-locular; terrestrial or aquatic plants. 



217A. Terrestrial or aquatic herbs; corolla-lobes convolute, induplicate or valvate in bud. 



Fam. 168. Gentianaceae, 735 

 217B. Terrestrial or epiphytic shrubs or herbs; corolla-lobes imbricate in bud. 



Fam. 180. Gesneriaceae, 812 

 175B. Ovary inferior or semi-inferior. 



218A. Tendril-bearing, climbing herbs with unisexual flowers; fruit a pepo Fam. 191. Cucurbitaceae, 846 



218B. Tendrils absent; fruit never a pepo. 

 219A. Anthers not united. 



