Xii KEY TO THE ORDERS. 



Ovules several in each cavity. Page 



Ovary with parietal placentae. 



Loasaceae in Order Opuntiales. 808 

 Ovary with central or basal placentae. 



Families in Order Myrtales. 822 

 Ovary exceeding the hjrpanthium, the top free. 



Hydrangeaceae in Order Rosales. 494 

 Plants with tendrils. 



Herbs: fruit a pepo: leaf-blades palmately veined. 



Cuciirbitaceae in Order Campanula les. 1134 

 Shrubby vines: fruit drupaceous, separating into nutlets: leaf-blades 



pinnately veined. Rhamnaceae in Order Rhamnales. 747 



** Petals more or less united. 

 Ovary superior. 



Stamens free from the corolla. t- -,■ ■ r^ j ti a^a 



Gynoecium of a single carpel. Families in Order Rosales. 494 



Gynoecium of several united carpels. 



Filaments united. . . ^ ■ t, Aar, 



Stamens diadelphous. Fumariaceae in Order Papaverales. 4b0 



Stamens monadelphous. ^ ,. , . ^ , ^ oro 



Anther-sacs opening by slits. Oxahdaceae in Order Oeraniales. b5S 



Anther-sacs opening by pores. 



Calyx and corolla very irregular. Order Poltgalales. bs2 



Calyx and corolla regular. Families in Order Ericales. 876 



Filaments distinct. 



Styles wanting or very short: stigma sessile. . ^ , ,, _„„ 



Aquifohaceae in Order Sapindales. 723 



Styles elongated. -^ -,■ ■ rx j -c- q-tr 



Ovary several-celled. Families in Order Ericales. 87b 



Ovary 1-celled. Armeriaceae in Order Primulales. 898 



Stamens partially adnate to the corolla. , . , 



Stamens as many as the lobes of the corolla and opposite them, or twice as many or more. 

 Ovary 1-celled. 



Placentae central or basal. Order Primulales. 898 



Placentae parietal. Fouquieriaceae in Order Hypericales. 781 



Ovary several-celled. _ ■ r^ ., t, AnA 



Upper portion of the ovaries distinct. Sedaceae m Order Rosales. 494 



Upper portion of the ovaries united. Order Ebenales. 908 



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



Corolla not scarious, veiny: fruit various, but not a pyxis. 



Gynoecium of 3-6 carpels. ..^,. -^jc -700 



Shrubs or trees: ovules and seeds few. Aquifohaceae in Order Sapindales. 7^6 

 Herbs, or creeping or tufted shrubby plants: ovules and seeds numerous. 

 Stamens adnate up to the sinuses of the corolla: creeping evergreen under- 



shrubs. Diapensiaceae in Order Ericales. 876 



Stamens adnate to the lower part of the corolla-tube: vines. 



Families in Order Polemoniales. 956 

 Gynoecium of 2 carpels. 



Carpels distinct, except sometimes at the apex. 



Style terminal Order Asclepiadales. 933 



Style basal. Dichondraceae in Order Polemoniales. 95b 



Carpels united. ^ > ^ nn^ 



Ovary 1-celled, with central placentae. Order Gentianales. 921 



Ovary 2-celled, or falsely 4-celled, or if 1-celled with parietal placentae. 



Stamens 2 and opposite each other, or 3. Order Oleales. 916 



Stamens usually 4 or 5, if 2 by reduction not opposite each other. 

 Leaves with stipules or stipular lines at their bases. 



Spigeliaceae in Order Gentianales. 921 

 Leaves with no traces of stipules. Order Polemoniales. 956 



Corolla scarious, veinless: fruit a pyxis. Order Plantaginales. 1097 



Ovary inferior. 



Stamens with the filaments free from the corolla. 



Stamens 10: anther-sacs opening by termmal pores or chinks. . ^ , t- o^r 



Vacciniaceae in Order Ericales. 87b 

 Stamens 5 or fewer: anther-sacs opening by longitudinal shts. Order Campanulales. 1134 

 Stamens adnate to the corolla. j-c j ^ i„„„f „„f 



Ovary with 2-many fertile cavities and 2-many ovules: calyx unmodified, at least not 



Plan'ts tendril-bearing. Cucurbitaceae in Order Campanulales. 1134 



Plants not tendril-bearing. . . ^, , o , „ 1101 



Ovules mostly on basal placentae: plants parasitic. Order Santalales. llUl 



Ovules variously borne, but not on a basal placenta: plants not parasitic. 



Order Rubiales. 1104 



Ovary with one fertile cavity. „ . , • ^ j -n . ^„ qoq 



Ovules numerous on a basal placenta. Primulaceae in Order Primulales. »y» 

 Ovule solitary, the placentae not basal. 



Flowers not in heads, often in head-like spikes or racemes. 



Order Valerianales. 1127 



Flowers in involucrate heads. Order Carduales. 1148 



