OF THE GENERA. XXXVU 



ExACUM. Calyx deeply 4-parted. Corolla 4-lobed,%ith the tube globose. 

 Stigma 2-cleft. Capsule bisulcate, 2-celled, many-seeded. GentianacecR^ 

 p. 240. 



SwERTiA. Calyx 4 — 5-parted. Corolla rotate, 4 — 5-parted; the seg- 

 ments with 2 glanduliferous fimbriate pores at the base of each. Stigmas 

 2-lobed, (rarely 2.) Capsule 1-celled, 2-valved, many-seeded. Gentiana- 

 cecB, p. 238. 



Frasera. Calyx 4-parted. Corolla deciduous, rotate, 4-parted, with 1 or 

 2 fringed glands on each lobe. Capsule compressed, 1-celled, 2-valved. 

 Seeds few, large, winged. Gentianacece, p. 238. 



Halenia. Calyx 4 — 5-parted. Corolla campanulate, 4 — 5-cleft ; the 

 lobes erect, equalling the tube, with a glanduUferous spur at the base. 

 Capsule 1-ceIled, 2-valved^any-seeded. Gentianacea, p. 237, 



Obolaria. Calyx 2-parted, in the form of bracts. Corolla campanulate, 

 4-cleft. Stamens somewhat didynamous, proceeding from the clefts of the 

 corolla. Stigma emarginate. Capsule ovate, 1-celled, 2-valved, many- 

 seeded. Orobanchacccz^ p. 258. 



(Some Gentiance, see CLASS V., Order II.) 



* Perianth double. Corolla 4 — 5-petaUed, inferior. 



Ammannia. Calyx 4— 5-toothed or lobed, the sinuses expanding into 

 teeth or horns. Petals 4, or wanting. Capsule globose or ovate, many- 

 seeded. Lythracece, p. 115, 



Ptelea. Calyx mostly 4-sepalled, Petals much longer than the sepals. 

 Torus tumid, pentagonal. Samarse membranaceous, margined, 2-celled; 

 cells 1 — 2-seeded. Zanthoxylacece, p. 68. 



***** Perianth single, inferior. 



Symplocarpus. Spathe ventricose-ovate, acuminate. Spadix roundish, 

 covered with perfect flowers. Perianth deeply 4-parted, persistent. Berries 

 numerous, globular, imbedded in the spadix. AracecB, p. 383. 



Alchemilla. Perianth with the tube somewhat contracted at the top ; 

 limb 8-parted, the alternate lobes smaller. Carpels 1—2, with a fihform 

 capitate style on the side, at length dry and 1-seeded. Sanguisorbacecs, 

 p. 106. 



Order II.— DIGYNIA.— 2 Pistils. 



m 



Hamamelis. Calyx 4-lobed, with 2—3 bracteoles at the base. Petals 4, 

 long, ligulate. Capsule coriaceous, 2-celled,, 2-valved at the top. Haviame- 

 lidacece, p. 141. 



Order III.— TETRAGYNIA.— 4 Pistils. 



Ilex. Calyx 4 — 5-toothed, persistent. Corolla 4 — 5-parted nearly to the 

 base, rotate. Stamens 4 — 5. Stigmas 4 — 5, sometimes united. Fruit 

 fleshy, with 4 — 5-ribbed or veined nucules. Aquifoliacea, p. 227. 



Sagina. Calyx 3 — 5-parted. Petals 4 — 5, or none. Capsule 1-celled, 

 4-valved, many-seeded. Caryophyllacece, p. 47. 



TiLL^A. Calyx 3 — 4-parted. Petals 3— 4, oblong, acuminate. Carpels 

 3 — 4, distinct, opening by the inner suture, 2— many-seeded. Crassulacece, 

 p. 121. 



