VERVAIN FAMILY 741 



keeled. Corolla 2-lipped; tube curved; limb 4-lobed, oblique. Stamens 4, 

 didymous; connective of the anthers not a])i)endaged. Ovary 2-celled; stigma 

 oblique; o\niles solitary in each cell. Fruit tardily separating into two nutlets. 

 [Lippia in part.] 



Leaves from linear-oblanceolate to cuneate, 2-8-toothed above; pediinclas slightly if any 



exceeding the leave.s. 1. P. cuncifolia. 



Leaves lanceolate, oblong, or oval, sharply serrate; peduncles much exceeding the leaves. 



2. P. lanceolata. 



1. P. cuneifolia (Torr.) Greene. Stems branched at the base, procumbent 

 or creeping, 2-10 dm. long; leaves opposite and more or less fascicled in the 

 axils; blades 1-3 cm. long; midvein prominent, the lateral ones obsolete; corolla 

 purplish or whitish, 4 mm. long. Lippia cuneifolia (Torr.) Steud. Plains and 

 prairies: S.D. — Tex. — Ariz. — Wyo. Plain — Suhmont. Je-Au. 



2. P. lanceolata (Michx.) Greene. Stem branched from the base, pro- 

 cumbent, 1-4 (hn. long; leaves opposite, rarely fasciculate; blades elliptic-lance- 

 olate, 1.5-5 cm. long, acute, with about 4 pairs of lateral veins; corolla pale blue, 

 2-2.5 mm. long. Valleys: Ont.— Fla.— Tex.— Neb. Plain—Son. Je-0. 



Family 115. LAMIACEAE. Mint Family. 



Aromatic herbs or shrubs, with 4-angled stems. Leaves opposite or 

 whorled, simple, usually toothed or lobed, glandular-punctate. Flowers 

 perfect, irregular, zygomorphic, or nearly regular, pseudo-verticillate, i. e., 

 in congested axillary reduced cymes. Calyx of 5 united sepals, sometimes 

 regular, sometimes irregular, and then usually 2-lipped. Corolla bilabiate, 

 or nearly regular. Stamens 4, didynamous, or one of the pairs abortive; 

 anthers 2-celled. Gynoecium of united carpels; ovary 4-lobed and 4-ceIled; 

 styles united, arising between the lobes; stigma terminal; ovules solitarj' in 

 each cell. Fruit of 4 nutlets, included in the persistent calyx. Endosperm 

 fleshy or w^anting. 



Ovary of 4 united nutlets; style not basal: nutlets laterally attached. 

 Corolla strongly bilateral, the upper lip very small, the lower large. 



Flowers in small congested cymes, axillary to small bracts, and forming a raceme- 

 like panicle; calyx-lobes shorter than the tube; leaves toothed. 



1. TEUCRrUM. 



Flowers soUtary in the axils of bracts similar to the leaves ; calyx-lobes longer 

 than the tube; leaves laciniate. 2. Melosmon. 



Corolla almost regularly 5-lobed, but lobes declined; stamens long-exserted and 

 coiled. 3. Trichostema. 



Ovary of 4 distinct or nearly distinct nutlets; styles basal; nutlets basally attached. 

 Corolla bilabiate. 



Calyx 2-lipped; both lips entire; stamens 4. 



Calyx not inflated, the upper lip with a crest on the upper side. 



4. Scutellaria. 

 Calyx inflat<'d, without a crest. 5. S.\L.\z.'VRi.\ 



Calyx cithtT L'-lippid :uid at least one of the Ups toothed, or regularly 4-5-toothed. 

 Stamens iiicliKlcd in the corolla-tube. 6. M.ARRUBIUM. 



Stamens exstTtcd from the tube. 

 Upper lip of the corolla concave. 

 Anther-bearing stamens 4. 



Upper stamens longer than the lower. 

 Calyx 5-toothed. 



Anther-sacs parallel or nearly so; stamens divergent. 



7. Ag.\st.\che. 

 Anther-sacs divaricate; anther approximate in pairs. 



Flowers in terminal spikes; floral leaves reduced; plant 



erect. 8. Nepet.v. 



Flowers in axillary verticils; floral leaves like the rest; 

 plant spreading. 9. Glecom.\. 



Calyx distinctly 2-lipped. 10. Mold.wka. 



Upper stamens shorter than the lower. 



Calyx distinctly 2-lipped, closed in fruit. 11. Prunelia. 

 Calyx 5-toothed, not 2-lipped, open in fruit. 



Calyx membranous, inflated in fruit, faintly nerved. 



12. DR.\fOCEPH.\LUM. 



Calyx not membranous, not inflated in fruit, strongly 5-10- 

 nerved. 



