462 OEDEB XCI. LABIAT.E. 



small ; lower large, emarginate. Corolla bilabiate, ringent ; 

 the upper lip arched, entire, the lower 3-lobed. Capsule ovate, 

 2-celled, 2-valved. Seed numerous, winged. 



1. S. Ameri'gaxa, (L.) Stem pubescent, angled, simple. Leaves al- 

 ternate, lanceolate, entire, sessile. Flowers in terminal racemes, nearly 

 sessile. ^Srac^s 2, as long as the calyx. — Dull purple. 11. May — June. 

 Pine-barrens. 



Genus XX.— PEDICULA'RIS. L. 13—2. 

 (From pediculus, a louse, from its supposed effect on sheep.) 



Cali/x 2-cleft at the summit, obliquely truncate. Corolla 

 ringent, with the upper lip emarginate, compressed. Stamens 

 4. Capsule 2-celled, mucronate, oblique. Seeds few in each 

 cell, slightly angled. 



1. P. Canaden'sis, (L.) Ste7n simple, succulent, pubescent. Leaves 

 pinnatifid, with the segments notched and toothed, the lower ones 

 crowded, with compressed petioles. Flowers in leafy spikes ; lower 

 lip of the corolla 3-lobed, middle lobe smallest. — Yellow, tinged with 

 purple. 21- March — April. Common. 6 — 12 inches. 



Gexus XXL— MELAMPY'RUM. L. 13—2. 

 (From melos, black, and puros, wheat.) 



Cali/x 4-cleft ; upper lip of the corolla compressed, with the 

 margins folded back ; lower lip trifid, grooved. Capsule oblique, 

 2-celled, 2 seeds in each cell. 



1. M, America'num, (Mich.) Stem erect, branching, terete ; lower 

 loaves linear, entire, the upper ones lanceolate, toothed at the base, all 

 opposite. Flowers axillary, solitary. Seeds oblong, cartilaginous. — 

 Yellow. @. June — July. Mountains. 



Order XCI. —LABI A'TJE. {Labiate Famibj.) 



Calyx tubular, persistent, regular, or bilabiate, hypogynous. 

 Corolla bilabiate, with the upper lip entire, or bifid, the lower 

 3 -cleft. Stamens 4, didynamous, the two shorter being some- 

 times abortive, inserted into the corolla. Ovary 4-lobed ; ovules 

 4. Style 1, arising from the base of the lobes; stigma bifid. 

 Fruit inclosed within the persistent calyx. Seed erect, with 

 little or no albumen. Usually herbaceous plants, with whorled, 

 spiked, or capitate flowers and square stems, and opposite 

 branches and leaves. 



ANALYSIS. 



1. stamens 2 2 



Stamens 4 T 



2. Calyx bilabiate 3 



Calyx Avith the segments nearly equal 5 



3. Corolla yellow Collinsonia, 12 



Corolla not yellow 4 



4. Flowers purple IlecUnma, 10 



Flowers blue or violet Salvia, 13 



6. Corolla bilabiate « 



Corolla nearly regular, 4-lobed Lycopus, 8 



