12. HYSSO'PUS, L. Hyssop. (Hebrew ezeb ; Arabic uzzof; English hyssop.) Calyx tubular, 15-striate, equally 5-toothed, upper lip of the corolla erect, flat, emarginate, lower lip 3-parted, the middle segment largest, tube about as long as the calyx ; stamens 5, exserted, diverging.

H. officinalis L. Lvs. linear-lanceolate, acute, entire, sessile; cal. teeth erect; fls. in racemous, secund verticils; middle division of the corolla 2-lobed, entire. -Labiatae Labiate Plants Part 4 1228 Cultivated for its reputed medicinal properties. A handsome plant, growing in tufts 2f high, with delicate foliage and bright blue flowers. Jl.‡ S. Eur.

13. PYCNAN'HEMUM, Mx. Basil. (Gr.Labiatae Labiate Plants Part 4 1229 dense, Labiatae Labiate Plants Part 4 1230 alluding to the dense, capitate inflorescence.) Calyx tubular, 10 to 13-striatc, 5-toothed, teeth equal or subbilabiate, throat naked within; upper lip of corolla nearly entire, lower lip trifid, middle lobe longest, all ovate, obtuse, stamens 4, distant, subequal, anthers with parallel cells.- Labiatae Labiate Plants Part 4 1231 Erect, rigid herbs, all N. American. Verticils dense, many-flowered.

§ Calyx subbilabiate, in flattish often loose cymes. Leaves petiolate. (a)

§ Calyx subequally cleft, in roundish, dense heads, (b)

a Teeth of the calyx ovate, acute, awnless.......................................

No. 1

a Teeth of the calyx produced into bearded awns, shorter than corolla.....

Nos. 2 - 4

b Calyx teeth and bracts with naked awns equaling the corolla.................................

Nos. 5, 6

b Calyx shorter than the corolla.-Heads panicled Leaves subpetiolate..........

Nos. 7-9

-Heads corymbed. Leaves sessile .......

Nos. 10 -12

- Head solitary, large.................................

No. 13

1 P. albescens Torr. & Gr. Lvs. ovate or lance-ovate, subserrate, acute at each end, subglabrous, whitened beneath, the upper whitened both sides, all petiolate; fls. separate, at length in little secund racemes; cal. teeth much shorter than its tube.-Ala. to La, St. 2 to 3f high, much branched. Lvs. 18" to 3' long, often puberulent beneath. Cymes many, in fruit 1'to 18" broad. Fls. as in all the species, small, reddish.

2 P. Tullia Benth. Lvs. ovate or oblong, acute or acuminate, subserrate, and with the stem villous-pubescenl, the floral whitened, fls. separate, at length in little secund simple racemes; cal. teeth ending in subulate, bearded awn?, about equaling the tube.-Mts. of E. Tenn., N. Car. to Ga, Lvs. as in No. 1, varying from ovate to lanceolate. Lower lip of calyx somewhat shorter.

3 P. incanum Mx. Wild Basil. Lvs. oblong-ovate, acute, subserrate, rounded at the base, petiolate, hoary-tomentous beneath, the floral whitened both sides; cymes dilated, not in racemes; cal. teeth subequal, subulate, aristate, bearded at apex.-Rocky woods and barrens, Can., N. Mid., W. States. St. 2 to 4f high, covered with soft, whitish down like the rest of the plant. Cymes all canesoent, 1' or less broad. Cor. pale red, dotted with purple. Aug. (P. Loomisii, Nutt.)

4 P. clinopodioides Torr. & Gr. Lvs. oblong-lanceolate, acute at each end, subserrate, smoothed above, pubescent beneath; sts. and branches villous-pubescent; cymes contracted and almost capitate, terminal and sessile at the upper nodes; bracts ciliate; cal. teeth subulate, often tufted with hairs at apex.-Dry soils, N. Y., N. J., to Ind. Plant corymbously branched, 2 to 3f high, scarcely canescent, never whitened. Lvs. 2 to 3' long. Cymes less than 6" broad. Aug., Sept

5 P. aristatum Mx. Lvs. ovate-oblong, acute, subserrate, rounded at base, on short petioles, and with the stem glabrous or minutely canescent-downy; bracts rigid, pointed with beardless awns like the calyx teeth, as long as the corolla.-Pine barrens, N. J. to Fla. St 1 to 2f high. Lvs. 18" to 2' long, the floral sometimes whitened. Heads few, rather larger (6 to 9" diam.)

6 P. hyssopifolium Benth. Lvs. linear-oblong, obtuse, subentire, subsessile, and with the stem glabrous or minutely canescent-downy; hds. few, large (nearly 1' diam.). Barrens, Va to Fla. and La. St. 1 to 2f high. Lvs. 1' to 18" long, less rigid than in No. 5.

7 P. Torreyi Benth. Lvs. linear-lanceolate, acute, thin, nearly entire, tapering at base to a very short petiole, and with the stem slightly pubescent; bracts and subulate calyx teeth white-pubescent.-Dry soils, near N. Y. city, and in N. J. Perhaps too near P. lanceolatum, but the tapering, petiolate base of the long, narrow, thin leaves are usually well defined. Cymes scarcely capitate. Aug., Sept.

8 P. pilosum Nutt. Lvs. lanceolate, subentire, acute at each end, subsessile, and with the stem and branches more or less clothed with soft, spreading hairs; cal. teeth ovate-lanceolate, acute, and with the bracts canescent-villous.-Prairies, etc, W. States to Tenn. and Ga. Plant about 2f high, paniculately branched (but the lower branches longer, ascending), hoary with a pubescence, never whitened. Lvs. 2 to 3' long. Cymes somewhat dilated, hardly capitate, 6 to 9" broad. Aug.

9 P. muticum Pers. Lvs. ovate or ovate-lanceolate, acute, remotely subserrate, rounded or subcordate at the base, subpetiolate, the upper with the corymbously paniculate branches minutely pubescent and whitened; cal. teeth triangular-ovate, equal, short, the bracts scarcely longer.-Dry woods, Me. to La. Plant 2 to 3f high. Lvs. of a firm texture, 1 to 2 1/2' long, usually half as wide. Heads small, compact, roundish, 4 to 6" diam. Cor. purplish white, dotted. Aug.

10 P. lanceolatum Ph. Lvs. linear-lanceolate, entire, acute, rigid, rounded at base, sessile, nearly glabrous, the corymbous branches pubescent on the angles; cal. teeth short, triangular-ovate, hairy.-Common in dry woods, Mass. to Ill., Tenn. and N. Car. Handsome and fragrant, 1 to 3f high. Lvs. 18" to 2' long, 2 to 5" wide. Hds. dense, all raised to near the same level, 4 to 6" broad. Cor. purplish, spotted. Aug.

11 P. linifolium Ph. Glabrous, corymbed; lvs. linear, attenuated to each end, sessile, entire, rigid; hds. compact; bracts ciliate and cal. teeth pungently awn-pointed.-Dry woods and prairies, Mass. to Iowa, Ky. and Ga. Plant very smooth, little fragrant, 1 to 2f high. Lvs. 1' to 18' long, 1 to 3" wide. Hds. small, numerous, dense. Fls. whitish. Aug.

12 P. nudum Nutt. Glabrous, pale green, subsimple; lvs. small, few ovate-oblong, obtuse at each end, entire, sessile; fls. in loose heads, terminal, corymbed, inner bracts subulate, very short.-Mts. N. Car. to Ga. St. strict, 1 to 2f high. Lvs. erect, 1' long or less. Hds. few-flowered. Cor. pubescent. Jl., Aug.