458 OKDEK XO. SCKOrilULAKIACEiE. 



Genus IX.— LINDER'NIA. L. 2—1. 



(In honor of F. B. Yon Linden.) 



Cahjx pubescent, 5-leaved. Corolla bilabiate, 4-cleft ; ihn 

 upper lip short, reflexed, emarginate ;. the lower lip 3-cleft, with 

 the segments oval, obtuse. Stamens 4, the two longest sterile. 

 Capsule 2-valved, 2-celled, many -seeded. 



1. L. dilata'ta, (Ell.) Stem procumbent, smooth, square. Lcava 

 oblong, ovate, aniplexieanl, sparingly toothed. Flowers axillary, on 

 square peduncles, covered with glandular hairs. Corolla resujiinate. 

 Stigma compressed. — Pale purple. ©. May — Sept. Around ponds. 

 6 — 8 inches, Gratiola tctragona. 



2. L. attenua'ta, (Muhl.) Stem procumbent or erect, square, gla- 

 brous. Leaves lanceolate and obovate, narrowed at the base. Flotcers 

 on erect peduncles, shorter than the leaves, axillary, solitary. — Purplo. 

 0. May — June. Wet places. 6—8 inclies. L. refracta. 



Genus X.— MICRAN'THEMUK Mich. 2—1. 

 (From mikros, small, and anthos, flower.) 



Cahjx 4-parted. Corolla 4-cleft, segments unequal. Sta- 

 mens 2. Capsule 1-celled, 2-valved, many-seeded. 



1. M. orbicula'tum, (Mich.) Ste7n prostrate, creeping, glabrous, te- 

 rete. Leaves opposite, sessile, orbicular, abruptly narrowed at the base, 

 entire, obscurely 5-nerved. Flowers axillary, solitary, on short pedun- 

 cles; segments of the calyx slightly spatulate, the two upper ones 

 shorter. Corolla shorter than the calyx ; the lower segments elongated. 

 Stamens dilated at the base. A7i(hers globose, 2-lobed, white. Style 

 fihform. Capsule globose, 2-celled, 2-valved, many-seeded, with central 

 placentae. — White. If. Through the autumn. Very common. 3 — 6 

 inches. Round-leaved Micrayithemum. 



2. M, emargina'tum, (Ell.) Stem prostrate or floating, creeping 

 Leaver sessile, oval, and obovate, entire, emarginate, obscurely 5-neived, 

 Flowers smaller than the preceding, on very short peduncles, — White. 

 % Through the summer. Common in wet places. 



Large-lea red Micrav'themum 



Genus XL— YEROX'ICA. L. 2—1. 

 (Origin of the name uncertain.) 



Calyx 4, rarely 5-parted. Corolla 4-lobed, unequal ; the 

 lower segments narrowest. Stamens 2. Capsule 2-celled, ob 

 cordate. Seed few. 



1. V. Virgin'ica, (L.) Stem erect, glabrous, slightly angled. Leaves 

 verticillate, by fours or fives, lanceolate, acute, serrate, pubescent be 

 neath. Flowers in long, axillary spikes. Corolla tubular. Style long, 

 persistent. — White. 1[ . June — Aug. Mountains. 2 — 3 feet. 



2. V. America'na, (Schw.) Glabrous ; stem decumbent, assurgent. 

 Leaves ovate, jietiolate, thick, serrate, subcordate at the base. Racnnes 

 opposite, long. Capsule orbiculate, obtuse, emarginate. — Blue. li. 

 May — June. Dump jilaces. 1 — 2 feet. 



3. V. peregri'na, (Pursh.) Stem erect, terete, glabrous, frequeiiily 

 simple. Lower leaves opposite, oblong, toothed ; the upper ones alter 



