0V THE GENERA. XXXV11 



EXACUM. Calyx deeply 4-parted. Corolla 4-lobed, with the tube globose. 

 Stigma 2-cleft. Capsule bisulcate, 2-celled, many-seeded. Gentianacea 

 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- 

 cea, 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 glanduliferous spur at the base. 

 Capsule 1-celled, 2-valved, many-seeded. Gentianacece, 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. Orobanchacctf, p. 258. 



(Some Gentidna, see CLASS V., ORDER II.) 



* Perianth double. Carotta 4 5-petalled, 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. L/ythracefB, 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. Zanthoxylacea, 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. Aracetz, p. 383. 



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

 limb 8-parted, the alternate lobes smaller. Carpels 12, with a filiform 

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

 p. 106. 



ORDER II. DIGYNIA. 2 Pistih. 



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

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

 lidacefB, p. 141. 



ORDER III. TETRAGYNIA.--1 Pistils. 



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

 base, rotate. Stamens 4 5. Stigmas 45, sometimes united. Fruit 

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



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

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



TILLJEA. Calyx 3 4-parted. Petals 3 4, oblong, acuminate. Carpels 

 34, distinct, opening by the inner suture, 2 many-seeded. Crassulacea, 

 p. 121. 



