ki:y to the families 



OvTile with a ventral raphe; leaves mostly alter- 

 nate; blades lobed or compound. 



94. Arali.vceae 633 

 Ovule with a dorsal raphe; leaves mostly op- 

 posite; blades entire or merely toothed. 



95. CORNACEAE 634 



Fruit dry, a cremocarp; gynoecium 2-carpellary ; 



stigmas terminal. 93. Ammiaceae 606 



Styles united, or single. 



Ovary enclosed in or surpassed by the hypantliium or 

 adnate to it. 

 Anthers opening bj' pores; fruit a berry. 



99. Vacciniaceae 643 



Anthers opening by slits; fruit a capsule. 

 Ovary with parietal placentae. 



87. Loasaceae 569 



Ovary with central or basal placentae. 



Hj-panthium merely enclosing the ovarj'. 



90. Lythr.\ceae 582 

 Hypanthium adnate to the ovary. 



91. Onagraceae 583 

 Ovary exceeding the hypanthium, the top free. 



58. Hydr.\jngiace.\e 392 



Plants with tendrils ; fruit a pepo ; leaf-blades palmately veined. 



129. Cucurbitaceae 821 



Petals more or less united. 

 A. Ovary superior. 



1. Stamens free from the corolla. 



Gynoecium of a single carpel; corolla papiUonaceous. 



65. Fabace.-VE 454 



Gynoecium of several united carpels. 

 Filaments imited. 



Stamens diadelphous. 51. Fumariaceae 319 



Stamens monadelphous. 



Anther-sacs opening by sUts; calyx and corolla regular. 



67. OXALIDACEAE 533 



Anther-sacs opening by pores; calyx and corolla very 



irregular. 73. Polygalaceae 540 



Filaments distinct. 



Corolla regular; anthers distinct. 



Herbaceous saprophj-tes, without green leaves. 



97. Monotropaceae 638 

 Herbs or shrubs with green leaves. 



Corolla of essentially di.stinct petals, i. e., united only 

 at the base; herbs with rootstocks. 



96. PYROL.\rE.\£ 635 

 CoroUa of distinctly united petals; shrubs. 



98. Ericace.\E 639 

 Corolla irregular; one of the petals free; anthers united. 



69. Bals.vminaceae 536 



2. Stamens partially adnate to the corolla. 



a. 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. 100. Primi laceae 646 



b. 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. 

 t Carpels distinct, except sometimes at the apex. 

 Styles luiited; stamens distinct or gynandrous. 



105. Apocynaceae 667 



Stj'les distinct; stamens monadelphous. 



lOG. Asclepiadaceae 669 



tt Carpels united. 



Ovary 1-celled, with central placentae. 



Corolla-lobes convolute or imbricated m the bud; leaves 

 typically opposite and simple. 



103. Ge.\tian'.\CEAE 657 

 Corolla-lobes induplicate-valvate in the bud ; leaves al- 

 ternate, in ours mostly basal and trifoliolate. 



104. Menyanthaceae 667 

 Ovary 2-3-cclled, or falsely 4-cclled, or if 1-celled with 



parietal placentae. 

 Stamens 2, opposite to each other; corolla regular. 



101. Oleaceae 655 

 Stamens usually more than 2, if only 2 not opposite to 



each other and the corolla irregular. 

 Leaves with stipules or stipular Imes. 



102. Loganiaceae 657 



