xiv NATURAL ORDERS. 



LX. PLANTAGlNEiE (figs. 828-33). Corolla scarious. Stamens 

 isomerous. 



Sub-class 4. Monochlamyda.— Perianth really or apparently 

 simple or none. Exxeptions. — Petals are present in some Jllece- 

 bracece. 



LXI. Illecebrace;e (figs, 834-8). Perianth small, rarely 

 double. Ovary with i cell and ovule, but 2 or 3 styles or strgmas. 

 Leaves usually opposite, with scarious stipules. 



LXII. Chenopodiace^ (figs. 839-57). Perianth small; 

 stamens opposite to its lobes. Ovary with i cell and ovule, but 2 

 or more styles or stigmas. No stipules. 



LXI 1 1. POLYGONACE.4: (figs. 858-79). Perianth small. Ovary 

 with I cell and ovule, but 2 or more styles or stigmas. Stipules 

 sheathing. 



LXIV. ThymeleaCE^ (figs. 880-1). Stamens inserted in the 

 tube of the perianth, and usually double the number of its lobes. 

 Ovary free, with I pendulous ovule. One style. 



LXV. EL.5;AGNACE/e (fig. 882). Shrubs or trees, with scurfy 

 leaves. Flowers mostly unisexual. Ovary free in the bottom of 

 the perianth-tube, with i erect ovule. 



LXVL SantA'LACE/e (fig. 883). Perianth-lobes valvate. 

 Ovary inferior, i-celled, with 2 or 4 pendulous ovules. Spike simple. 



LXVII. Aristolochiace* (fig. 884). Perianth irregular, or 

 3-lobed. Stamens 6 or 12. Ovary inferior, 3- or 6-celled, with 

 numerous ovules. 



LXVIIL Euphorbiace^ (figs. 885-99). Flower unisexual. 

 Fruit separating into 3 (rarely 2 or more) carpels, leaving a per- 

 sistent axis, each carpel containing I or 2 pendulous seeds. 



LXIX. Empetrace^ (fig. 900). Differs from Euphorbiaceae 

 in the ovules and seeds erect. 



LXX. Ceratophyllum and Callitriche (figs. 901-2). 

 Anomalous aquatic genera. Perianth none. Ovary with I or 4 

 cells, and i seed in each. 



LXXL Urticace/E (figs. 903-7). Flowers unisexual, small 

 and green. Stamens opposite the perianth divisions (usually 4). 

 Ovary free, with a single ovule, and 2 (rarely i) styles or stigmas. 



LXXIL ULMACEiE (figs. 908-9). Trees. Flowers often bisexual, 

 the stamens opposite the lobes. Ovary free, 2-celled, with 1 erect 

 ovule in each cell. 



LXXIIL AmentacEjE (figs. 910-35). Trees or shrubs. 

 Flowers unisexual, the males in catkins with an imperfect perianth, 

 or none at all. Fruit of the females i -celled. 



LXXIV. Conifer"^ (figs. 936-8). Trees or shrubs with stiff 

 or scale-like leaves. Flowers unisexual, the males in catkins 



