324 
LABIATjE. (mint family.) 
4. P. pildsum, Nutt. Downy with long and soft whitish hairs , 
much branched; leaves lanceolate, acute at both ends, nearly entire and 
sessile, the floral not whitened.; calyx-teeth ovate-lanceolate, acute, and 
with the bracts hoary-haired. — Dry hills and plains, Ohio and south¬ 
ward. July, Aug. 
5 P. mu tic urn, Pers. Smooth or minutely hoary throughout, 
corymbosely much branched ; leaves ovate or broadly ovate-lanceolate, 
acute, rounded or slightly heart-shaped at the base , mostly sessile, mi¬ 
nutely toothed, rigid , prominently veined ; the floral ones , with the 
bracts and triangular-ovate calyx-teeth hoary with a fine close down. 
(P. aristktum, Bigelow , not of Michx. Brachystemum muticum, 
Michx.) — Dry hills, Maine to Ohio, common southward. Aug.— 
Plant 1° -2° high, bushy. Flowers in rather dense heads ; the outer 
bracts ovate-lanceolate and pointed, the others pointless, not longer 
than the calyx. 
■*- Flowers in close heads, crowded with rigid bracts. 
6. P. lanceolatum, Pursh. Smoothish or minutely downy , 
corymbosely much branched above, very leafy; leaves lanceolate or 
almost linear, entire, rigid, obtuse at the base, sessile; bracts ovate- 
lanceolate, barely pointed, downy, as well as the short triangular teeth 
of the calyx. (Brachystemum Virginicum, Michx.) — Thickets and 
hills, common. July-Aug. — Plant 2° high, the small dense heads 
numerous, clustered. 
7. P. linifolium, Pursh. Smooth, or nearly so; leaves nar¬ 
rowly linear, crowded; bracts slightly awned; calyx-teeth lanceolate- 
awl-shaped: otherwise nearly as No. 6. — Thickets, from Nantucket 
and Connecticut southward and westward. July. 
arista turn, Michx. Smooth or minutely hoary, sparing¬ 
ly branched; leaves ovate-oblong, acute, slightly toothed, rigid, round¬ 
ed at the base, short-petioled ; the floral often whitened; flowers in few 
and dense rather compound clusters ; bracts and calyx-teeth awl-shay - 
ed and awn-pointed, as long as the corolla. — Pine barrens of New 
Jersey, and southward, rare. 
16. THYMUS, L. Thyme. 
Calyx 2-lipped, 13-nerved, hairy in the throat; the upper lip 
3-toothed, spreading ; the lower 2-cleft, with the awl-shaped di¬ 
visions ciliate. Corolla short, slightly 2-lipped ; the upper lip 
straight and flattish, notched at the apex; the lower spreading, 
equally 3-cleft, or the middle lobe longest. Stamens 4, straight 
and distant, usually exserted. — Low mostly prostrate and diffuse 
perennials, with small and entire veiny leaves, and purplish or 
whitish flowers. (The ancient Greek name of the Thyme, proba 
bly from 6v o>, to burn perfumes, because it was used for incense.) 
