800 FLORA. 



29. HYSSOPUS L. 



A perennial erect herb, the stem somewhat woody at the base, with narrow, 

 entire leaves, and small bracted purple or blue flowers, in dense clusters in the upper 

 axils, and forming elongated terminal spikes. Calyx tubular, 15 -nerved, about 

 equally 5-toothed. Corolla-limb 2-lipped, the upper lip erect, emarginate, the 

 lower spreading, 3-cleft. Anthers 2-celled, the sacs divaricate. Nutlets ovoid, 

 somewhat 3-sided, nearly smooth. [Greek, an aromatic herb.] A monotypic 

 genus. 



1. Hyssopus officinalis L. Hyssop. (I. F. f. 3152.) Stems usually several 

 together, strict, puberulent, 3-9 dm. high. Leaves linear to oblong, sessile or 

 nearly so, firm, acute at both ends or the lower obtuse, puberulent or glabrate, 

 faintly veined, 3-5 cm. long, sometimes with smaller ones or short leafy branches 

 in their axils; spike dense; outer bracts as long as the calyx; calyx-teeth lanceo- 

 late, acute; corolla 8-10 mm. long. Along roadsides and in waste places, Ont. to 

 Me. and N. Car., and on the Pacific Coast. Nat. from Europe. June-Sept. 



30. ORIGANUM L. 



Perennial herbs, some species shrubby, with crenate-dentate or entire leaves, 

 and small bracted pink or purple flowers, in dense terminal glomerules. Calyx 

 villous in the throat, about 13-nerved, 5-toothed or 2-lipped. Corolla-limb 2-lipped, 

 the upper lip erect, emarginate or 2-lobed, the lower longer, spreading, 3-cleft. Sta- 

 mens didynamous, ascending; anthers 2-celled, the sacs divergent. Nutlets ovoid 

 or oblong, smooth. [Greek, mountain- joy.] About 30 species, of the Old World. 



1. Origanum vulgare L. Wild Marjoram. Organy. (I. F. f. 3153.) 

 Perennial from nearly horizontal rootstocks, villous or hirsute; stem 3-8 dm. high. 

 Leaves ovate, petioled, rounded or subcordate, crenate or entire, 2.5-4 cm. long, 

 often with smaller ones in their axils; flower-clusters often 5 cm. broad; bracts 

 purplish, ovate or oval, about equalling the 5-toothed calyx; corolla pink, purple 

 or nearly white, the upper lobe broad; all four stamens, or the two longer, ex- 

 serted. In fields and waste places, Ont. to N. J. and Penn. Nat. from Europe. 

 July-Sept. 



31. KOELLIA Moench. [PYCNANTHEMUM Michx.] 



Perennial, mostly fragrant erect herbs, with small white or purple-dotted flow- 

 ers, in terminal or sometimes also axillary capitate glomerules or cymose clusters. 

 Calyx 10-13 -nerved, 5-toothed, not villous in the throat, the 2 upper teeth some- 

 times united below. Corolla 2-lipped, the upper lip emarginate or entire, the lower 

 3-cleft. Stamens 4, didynamous, nearly equal, or the lower pair a little longer; 

 anther-sacs parallel. Nutlets smooth, pubescent, or roughened. [Named for J. 

 L. C. Koelle, a German botanist of the eighteenth century.] About 14 species, 

 of N. Am. Besides the following, 1 occurs in California and 1 or 2 in the Southern 

 States. 



* Leaves prevailingly linear, linear-lanceolate or oblong-lanceolate. 

 Calyx-teeth ovate-triangular, acute, one-fourth as long as the tube. 



2. K~, Virginiana. 

 Calyx-teeth subulate, lance-subulate or bristle-tipped. 



Leaves linear or lanceolate ; calyx-teeth subulate or lanceolate. 



Leaves linear or narrowly linear-lanceolate, entire. 1. K.flexuosa. 



Leaves lanceolate, entire, or usually serrate. 

 Bracts appressed, erect ; clusters dense. 



Hirsute or pilose; leaves mainly entire. 3. K. pilosa. 



Puberulent or glabrate; leaves mostly denticulate. 



4. K. verticillata. 

 Bracts spreading; clusters loose. 5. A', clinopodioides. 



Leaves oblong to linear-oblong, obtuse or subacute; calyx-teeth awn-like. 



6. K. hyssopifolia. 



* * Leaves prevailingly ovate, ovate-oblong or ovate-lanceolate. 



Calyx-teeth bristle-tipped or subulate. 



Bracts appressed ; clusters dense; calyx-teeth bristle-pointed. 



7. A", art's tat a. 



