312 LABIATE. (MIXT FAMILY.) 



$ 2. GLECHC-MA, L. Leaves all alike ; the axillanj dusters 



2. N. GLECH6MA, Benth. (GROUND IVY. GILL.) Creeping and trailing ; 

 leaves petioled, round kidney-shaped, crenate, green both sides ; corolla thrice 

 the length of the calyx, light blue. (Glcchoma hedcracca, L.) Shaded, waste 

 grounds near dwellings. May -Aug. Anthers with the cells diverging at a 

 right angle, each pair approximate and forming a cross. (Adv. from Eu.) 



21. DRACOCEPHALUM, L. DRAGON-HEAD. 



Calyx tubular, 13- 15-ncrved, straight, 5-toothcd ; the upper tooth usually 

 much largest. Corolla 2-lipped ; the upper lip slightly arched and notched ; the 

 lower spreading, 3-cleft, with its middle lobe largest and 2-cleft or notched at the 

 end. Stamens 4, ascending under the upper lip ; the lower pair shorter. An- 

 thers approximate by pairs, the cells divergent. Whorls many-flowered, mostly 

 spiked or capitate, and with awn-toothed or fringed leafy bracts. (Name from 

 Sputtoi/, a dnu/vn, and Ke0aA^, head, alluding to the form of the corolla.) 



1. D. pnrviflorilin, Nutt. Stem erect, leafy (8' -20' high); leaves 

 ovate-lanceolate, sharply cut-toothed, petioled ; whorls crowded in a terminal 

 head or spike ; upper tooth of the calyx ovate, nearly equalling the bluish small 

 slender corolla. (2^ Koeky places, Jefferson and St. Lawrence Counties, 

 New York ; shore of Lake Superior, and northwestward. May -Aug. 



22. CEDRONEL.LA, Mceych. CEDROXELLA. 



Calyx rather obliquely 5-toothed, many-nerved. Corolla ample, expanded at 

 the throat, 2-lipped ; the upper lip flattish or concave, 2-lobed ; the lower 3- 

 cleft, spreading, the middle lobe largest. Stamens 4, ascending; the lower pair 

 shorter. Anther-cells parallel. Sweet-scented perennials, with pale purplish 

 flowers. (Name a diminutive of /ce'8/noi/, oil of Cedar, from the aromatic leaves 

 of the originial species, C. triphylla, the Balm-of-GUead of English gardens.) 



1. C. CO I'diita, Benth. Low, with slender runners, hairy ; leaves broadly 

 heart-shaped, crenate, petioled, the floral shorter than the calyx ; whorls fe-w- 

 flowcrcd, approximate at the summit of short ascending stems ; corolla hairy 

 inside (H ; long) ; stamens shorter than the upper lip. (Draeoccphalum corda- 

 tum, Nutt.) Low shady banks of streams, W. Pcnn. to Kentucky, and south- 

 ward along the mountains. June. 



23. SYNANDRA, Nutt. SYNANDRA. 



Calyx bell-shaped, inflated, membranaccous, irregularly veiny, almost equally 

 4-toothed ! Corolla with a long tube, much expanded above and at the throat ; 

 the upper lip slightly arched, entire ; the lower spreading and 3-cleft, with ovate 

 lobes, the middle one broadest and notched at the end. Stamens 4, ascending 

 filaments hairy : anthers approximate in pairs under the upper lip ; the two 

 upper each with one fertile and one smaller sterile cell, the latter cohering with 

 each other (whence the name; from <rvi/, toyetJier, and avrjp, for anth<-r). 



1. S. gramliflora, Nutt. Shaded banks, Ohio, Kentucky, ami south- 

 ward. June. A perennial? hairy herb, 1 high. Lower leaves long-petioietl, 



