438 ORDER LXXXm. — BIGNONIACE.E. 



8. S. gentianoi'des, (Ell.) Stem erect, slightly angled. Leaves linear, 

 acute, long. Flowers axillary and terminal, the terminal ones crowded. 

 Calyx campanulate, 8 — 10-parted, with the segments subulate. Corolla 

 8 — 10-parted, with obovate segments. Stamens short. — Red. U ? 

 Aug. — Sept. Middle Geo. Lapithea gentianoides, Gris. 



Genus IV.— CEXTAUREL'LA. Rich. 4—1. 

 (Diminutive of Centaurea.) 



Calyx 4-cleft, persistent, glabrous. Corolla campanulate, 

 persistent, 4-cleft. Stamens 4, inserted into the tube of the co- 

 rolla, short. Capsule 1-celled, 2-valved, many-seeded. 



1. C. ver'na, (Mich.) Stem simple, angular, glabrous. Leaves few, 

 resembling scales. Flowers terminal, 1 — 3. Calyx with lanceolate, ex- 

 panding segments. Style persistent. Stigma 2-cleft. — White. @. 

 Feb. — April. On the sea-coast of Geo. 4 — 8 inches. 



2. C. tanicula'ta, (Mich.) Stem smooth, with brachiate branches. 

 Leaves minute, subulate, those of the base alternate, those toward the 

 summit opposite. Flowers in panicles, on opposite peduncles, the lower 

 ones branched. Calyx 4-cleft, the two outer decurrent. Corolla about 

 the length of the calyx. — Greenish-white. ©. Aug. — Sept. In ditches 

 and damp grouuds. 8 — 12 inches. 



Genus V.— VILLAR'SIA. Vent. 5—1. 

 (In honor of D. Villars, a French hotanist.) 



Calyx 5-parted. Corolla rotate, with the limb 5-parted, 

 ciliate. Stamens 5. Style 1. Stigpia 2-lobed, glands 5, al- 

 ternating with the stamens. Capsule 1-celled, 2-valved, many- 

 seeded. 



1. V. lacuno'sa, (Vent.) Stem filiform, floating. Leaves reniform, 

 lacunose beneath, slightly crenate, on long petioles. Flowers somewhat 

 umbellate, arising from the petioles. — White. If. July — August. In 

 still waters. Limnanthemum lacunosum, Gris. 



Genus VI.— OBOLA'RIA. L. 13—2. 

 (From obolos, a small Greek coin.) 



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

 4-cleft ; segments equal, entire, or crenulate. Stamens 4, some- 

 what didvnamous. Stigma 2-cleft. Capsule 1-celled, 2-valved, 

 many-seeded. 



1. 0. Virgin'ica, (L.) Stem cespitose, simple, or sparingly branched, 

 glabrous. Leaves opposite, sessile, obovate, slightly decurrent, glabrous. 

 Flowers 2 — 3, on the summit of axillary branches. — White or red. 2£. 

 April — May. In rich soils. 4 — G inches. 



Order LXXX1II.— BIGNONIA'CE^E. {Trumpet-flower 

 Family.) 



Calyx divided. Corolla hypogynous, usually irregularly 

 4 — 5-lobed. Stamens 5, 1 or 3 sterile. Ovary 2-celled, or 



