174 LINN^AN CLASS Y. 



Apocynum. Calyx 5-parted. Corolla campanulate, 5-cleft, with 

 scales at the base, alternating with ,the lobes. Anthers sagittate. 

 Follicles long, slender. (Dog-bane.) (Indian Hemp.) Apocynacecs, 

 SO. 



Gelsemiimm. Sepals 5, small. Corolla funnel-form, border 5 lobed. 

 Capsule 2-celled, many-seeded. (Yellow Jessamine.) Loganiaceoe, 81. 



Asclepias. Calyx 5-parted, small. Corolla 5-parted ; lobes lanceo- 

 late, reflexed. Staminal crown 5-leaved ; leaflets opposite the anthers, 

 each usually with a subulate process. Follicles smooth or muricate, 

 rentricose. (Milk-weed, Silk-weed.) Asclepiadacece, 79. 



Amsonia. Calyx 5-parted. Corolla funnel-form, with the throat 

 closed. Estivation twisted. FoUicles 2, erect. Apocynacece, 80. 



Echites. Calyx 5-parted, with acute segments. Corolla funnel- 

 shaped, 5-parted, throat naked. Follicles 2, distinct, long, slender. 

 Apocynacece, 80. 



Gonolobtia. Calyx 5-parted. Corolla rotate, 5-parted. Staminal 

 crown shield-form, 5-parted. Follicles 2, ventricose. Asclepiadacece, 79. 



Hydrolea. Calyx 5-parted. Corolla campanulate. Anthers cordate. 

 Styles long, diverging. Capsule 2-celled. Seeds numerous. Hydro- 

 phyllacece, 85. 



Dichondra. Calyx 5-parted. Segments spatulate. Corolla short, 

 bell-form, 5-parted. Capsule 2-celled, 1 seed in each cell. Gonvolvu' 

 lacecB, 86. 



Stylisma. Convolvulus. Sepals 5, equal. Corolla campanulate. 

 Styles 2, rarely 3, stamens included. Convolvulacece, 86. 



Corolla b-petaled. 



Heuchera. Calyx inferior, 5-cleft. Petals small. Capsule 2-celled, 

 many-seeded. (Alum-root.) Sazifragacece, 59. 



Panax. Polygamous, or dioecious. Flowers in umbels. Styles 2 — 

 3. Involucre many-leaved. Fruit somewhat globular, 2 — 3-seeded. 

 (Ginseng.) Araliacece, 62. 



BoyTcinia. Calyx turbinate, or urceolate, cohering to the ovary; 

 limb 5-cleft. Petals entire. Styles 2 — 3. Capsule 2 — 3-cell8d, many- 

 seeded. Herbaceous, perennial plants. Flowers small in corymbose 

 cymes. Sazifragacece, 59. 



Corolla wanting. 



Atriplex. Flowers polygamous. Calyx 5-sepaled in the perfect 

 flower, 2-sepaled in the pistillate. Fruit depressed, 1-seeded. Gheno- 

 podiacecE, 100. 



Chenopodium. Calyx 5-parted, inclosing the fruit. Style 2-cleft. 

 Seed 1, lens- like, Ghenopodiacece, 100. 



Salsola. Perianth 5-cleft, investing the fruit. Styles 2. Embryo 

 spiral. ChenopodiacecB, 100. 



Ulmus. Calyx campanulate, 4 — 5-cleft. Seed 6, inclosed in a sa- 

 mara. Stamens 4 — 8. (Elm.) Ulmaceoe, 110. 



Geltis. Polygamous. Perfect flowers. Calyx 5-parted. Styles 

 spreading. Drupe 1-celled. Staminate flowers, with the calyx 6- 

 parted. Stamens usually 6. Small tree. Ulmacece, 110. 



