NATURAL OKDEES, • 51 



LTV. Solanum family. Stamens isomerous. Corolla plaited or im- 

 bricate. -Ovary two-celled, with several ovules in each cell. 



/3. Corolla irregular. Stamens one less or 3 less than the lobes. 



LV. Broomrape family. Leafless parasites. Placentas parietal, or rarelj 

 meeting in tlie axis. 



LVI. Scrophularia family. Ovary 2-celled, vrith several ovvdes in each 

 cell. 



LVII. Labiate family. Ovary 4-lobed, with one ovule in each lobe. 



LVI II. Vervein family. Ovary entire, 2- or 4-celled, with one ovule in 

 each cell. 



*** Anomalous families. 



LIX. Plumbago family. Ovary with one cell and ovule, but several 

 styles. 



LX. Plantain family. Corolla scarious. Stamens isomerous. 



Subclass 4. Monochlamyds. — Perianth really or apparently simple, or 

 none. 



LXI. Gooiefoot family. Perianth small ; stamens alternate with its 

 lobes. Ovary with one cell and ovule, but 2 or more styles, or stigmas. 

 No stipules. 



LXII. Polygonum family. Perianth small. Ovary with one cell and 

 ovule, but 2 or more styles or stigmas. Stipules sheathing. 



LXIII. Daphne family. Stamens inserted in the tube of the perianth, 

 and usually double the number of its lobes. Ovary free, with one pendidous 

 ovule. One style. 



LXIV. Elaeagnus family. Shrubs or trees, with scurfy leaves. Flowers 

 mostly unisexual. Ovary free in the bottom of the perianth-tube, with one 

 erect ovide. 



LXV. Sandalwood family. Periantii-lobes valvate. Ovary inferior, 1- 

 celled with 2 or 3 pendulous ovules. Styles simple. 



LXVI. Aristolochia family. Perianth irregular, or 3-lobed. Stamens 

 6 or 12. Ovary inferior, 3- or 6-celled, with numerous ovules. 



LXVII. Euphorb family. Flowers unisexual. Fruit separating into 3 

 (rarely 2 or more) carpels, leaving a persistent axis, each carpel containing 

 one or two pendulous seeds. 



LXVIII. Empetrum genus or family. Differs from the Euphorb family 

 in the ovules and seeds erect. 



LXIX. Ceratophyll and CaUitriche. Anomalous aquatic genera. Peri- 

 anth none. Ovary with 1 or 4 cells, and one seed in each. 



LXX. Nettle family. Flowers unisexual, small and green. Stamens 

 opposite the perianth-divisions (usually 4). Ovary free, with a single ovtde, 

 and 2 (rarely 1) styles or stigmas. 



LXXI. Elm tribe or family. Trees. Flowers often bisexual, the stamens 

 opposite the lobes. Ovary free, 2-celled, with one erect ovule in each cell. 



LXXII. Catkin family. Trees or shrubs. Flowers unisexual, the males 

 in catkins with an imperfect perianth, or none at all. Fruit of the females 

 one- celled. 



LXXIII. Pine family or class. Trees or shrubs with stiff or scale-like 

 leaves. Flowers unisexual, the males in catkins without perianth. Ovules 

 and seeds in the females not enclosed in any ovary or pericarp. 



