ARTIFICIAL KEY TO THE NATURAL ORDERS. XXI 



* * Ovary free from tfie calyx (superior). 



- Flowers irregular. Perfect stamens almost always less than 6. 

 Ovules and mostly the seeds numerous, or sometimes only 2, in each cell. 

 Pod 1-celled, with a free central placenta. Stamens 2. LENTIBULACELE, 275 



Pod 1-celled with 2- 4parietal placentae. Stamens4. Leafless plants. OROBANCHACEjE, 279 

 Pod falsely 2 - 5-celled : placentse parietal. Seeds without albumen. BIGNONIACE^E, 277 

 Pod 2-celled with the placentas in the axis. 



Seeds numerous, sometimes few, with copious albumen. SCROPHULARIACEJE, 281 



Seeds few in each cell, flat, entirely destitute of albumen. ACANTHACE M, 296 



Ovules and seeds (4, rarely 1) one in each cell. 



Ovary deeply 4-lobed ; the style rising from between the lobes. LABIAT^E, 300 



Ovary not lobed ; the style terminal. VERBENACE4E, 298 



<- *- Flowers regular ; stamens as many as the lobes of the corolla or calyx. 

 Ovary deeply divided around the single style into 4 one-ovuled lobes. BORRAGINACE.ffi, 319 

 Ovary 1-celled, with the ovules or placentae parietal. 



Leaves toothed or cut, often rough-hairy, petioled. HYDROPHYLLACEJE, 326 



Leaves entire, sessile and opposite, glabrous. > 



Leaves petioled, alternate, entire or with 3 entire leaflets. } GENTIANACILE, 341 



Ovary2-10-celled. 



Style none. Corolla deeply 4 - 6-parted. Shrubs or trees. AQUIFOLIACEJE, 263 



Style present. Plants with green herbage. 



Stamens 4. Pod circumcissile, and the partition loose. PLANTAGINACEJ3, 268 



Stamens 5, nearly or quite free from the corolla. ERICACEJ2, 245 



Stamens 5, borne on the corolla. 



Stipules present between the bases of opposite leaves. LOGANIEJ3, 174 



Stipules none. 



Leaves opposite. Pod 2-celled, with several winged seeds. GELSEMINEZE, 283 



Leaves opposite or alternate. Pod 3-celled, few-seeded. POLEMONIACEJ3. 329 



Leaves alternate Pod or berry many -seeded. SOLANACE^, 338 



Leaves alternate. Pod 2 - 6-seeded. * 



Style present. Plants destitute of green foliage. CONVOLYULACEJ5, 332 



Ovaries 2, separate ; their styles and stigmas also separate. ' 

 Ovaries 2, separate, but united at the top by a common stigma. 



Filaments distinct : pollen powdery, in ordinary anthers. APOCYNACEJ5, 349 



Filaments mostly monadelphous : pollen cohering in masses. ASCLEPIADACE^l, 351} 



*--- Flowers regular: stamens fewer than the lobes of the corolla. 



Low herbs. Pod circumcissile, 4 - many-seeded : partition separating. PLANTAGINACE^, 268 

 Shrubs. Drupe or berry 1-2-seeded. OLEACILE, 356 



DIVISION III. APETALOUS : corolla (and sometimes the calyx) wanting 



A. Flowers not in catkins. 

 * Ovary or cells of the ovary containing many ovules. 



Ovary and pod 6-celled, inferior (calyx-tube adherent). ARISTOLOCHIACEJ5, 359 



Ovary and pod 4-celled, inferior. Ludwigia in ONAGRACEJ3, 129 



Ovary and pod 3 -5-celled, superior (calyx free). 



Pod 5-beaked, opening across the beaka. Penthorum in CRASSULACE^, 139 



Pod beakless, circumcissile. Leaves fleshy. Sesuvium in PORTULACACE.E, 63 



Pod beakless, 3-valved. Leaves whorled. MOLLUGINEJE, 54 



Ovary 2-celled, superior. Flowers perfect, separate. 



Calyx enclosing the thin (at length often 1-celled) pod. Ammannia in LYTHRACE^, 127 

 Calyx none. Pod many-ribbed. Aquatic herbs. PODOSTEMACE.35, 384 



Ovary 2-celled, Flowers imperfect, capitate. Liquidambar in HAMAMELACEJS, 148 



Ovaries one or more, simple, one-celled. RANUNCUL ACE /, 2 



Ovary 1, compound, bnt only gne-eelled. 

 Placenta? 2. parietal Chiytospleniuui in 8AXIFRAGACEJS, 14) 



