354 LABIATE. Hyssqpm. 



tate ■ flowers in peduncled loose cymes, rudiments of the upper pair of stamens generally 

 apparent. — Spec. ed. 2, i. 30; Bart. Med. Bot. t. 42; Lodd. Bot. Cab. t. 1205; Sweet, Brit. 

 Fl. Gard. t. 243 ; Torr. Fl. N. Y. t. 76. Satureia origanoides, L., ed. 1. — Dry soil, S. New 

 York and Ohio to Georgia. 



12. HYSSCPUS, Tourn. Hyssop. (The ancient name, from a Hebrew 

 word.) Only one species. 



H. officinalis, L. Perennial herb, with somewhat woody base, virgate branches, lanceo- 

 late or linear entire leaves, and blue-purple flowers in small spiked clusters, in summer. — 

 Sparingly on roadsides eastward, and in California, escaped from gardens. (Nat. from 

 Eu. and Asia.) 



13. PYCNANTHEMUM, Michx. Mountain Mint or Basil. (From 

 IIv/.v6g, dense, avdsfiov, blossom : glomerate inflorescence.) — Perennial 'erect 

 herbs (all N. American, and all but one eastern), pleasantly pungent-aromatic, 

 branching above ; with capitate-verticillastrate glomerules or dense cymes (com- 

 monly multibracteate) in the upper axils, or mainly cymosely terminal ; flowers 

 small, whitish or purplish, often purple-dotted, in summer. — Michx. Fl. ii. 7, with 

 Braehystemum, 1. c. 5 ; Gray in Am. Jour. Sci. xlii. 44. 



§ 1. Flower-clusters naked in a terminal corymbose cyme, small, rather dense ; 

 the proper bracts minute and loose : calyx short-tubular ; the teeth equal : leaves 

 sessile and small. t 



P. nudum, Nutt. Nearly glabrous ; stem strict, 2 feet high : leaves oval, nearly entire, 



less than inch long, shorter than the internodes : calyx-teeth triangular, villous. — Gen. ii. 



34. — Low pine barrens, N. Carolina ? to Florida, Alabama, &c. 



§ 2. Flowers densely verticillastrate-cymose or glomerate, usually conspicuously 

 much bracted : calyx oblong or short-tubular. (Many of the species difficult of 

 discrimination, perhaps on account of hybridizing.) 



# Bracts and equal calyx-teeth aristate-tipped, rigid, naked, equalling the corolla: leaves slightly 

 petioled, rather rigid. 

 P. aristatum, Michx. Minutely soft-puberulent, mostly canescent : leaves ovate- and 

 lanceolate-oblong, sparingly denticulate ; flower-clusters dense or capitate, terminal. — Fl. 

 ii. 8, t. 33. P. verticillatum, Pursh, not Michx. P. setosum, Nutt. in Jour. Acad. Philad. 

 vii. 100. Origanum incanum, Walt. — .Pine barrens, New Jersey to Florida and Louisiana. 



Var. hyssopifolium, Gray, 1. c. (P. hy'ssopifolium, Benth.) : leaves narrowly 

 oblong or almost linear, nearly entire, obtuse. — Virginia to Florida. 



# # Bracts and equal (or later species nearly equal) and similar calyx-teeth not aristate. 

 -i— Leaves linear or lanceolate, nearly sessile, entire, mostly glabrous, very numerous throughout 

 the stems and copious brauclilets : capitate glomerules small and numerous, densely fastigiate- 

 cymose, copiously imbricated with short appressed rigid and subulate-pointed or acute bracts, 

 which do not exceed the equally 5-toothed calyx : lips of the corolla very short. (Braehystemum 

 Virginicum, Michx.) 



P. linif olium, Pursh. Glabrous up to the canescent inflorescence, 2 feet high, slender : 

 leaves linear, somewhat 3-nerved : bracts subulate or cuspidate-tipped from a broad base : 

 calyx-teeth lanceolate-subulate, rigid-pointed. — Fl. ii. 409. Satureia Virginiana, L., as to 

 syn. Pluk. Kcellia capitata, Moench, Meth. 408. Braehystemum linifolium, Willd. Enum. 623. 

 Pycnanthemum tenuifolium, Schrad. Hort. Gott. 10, t. 4. — Dry ground, Massachusetts to 

 Illinois, Florida, and Texas. 



P. lanceolatum, Pursh, 1. c. Stem stouter and somewhat pubescent : inflorescence 

 villous-canescent : leaves lanceolate or almost linear, nervose-veined, obtuse at base : 

 bracts ovate or lanceolate : calyx-teeth ovate-deltoid, merely acute. — Satureia Virginiana, 

 Herm. Parad. t. 218 ; L. Spec. ii. 567. Thymus Virginicus, L. Mant. 409. T. lanceolatus, 

 Poir. Suppl. v. 305. Nepeta Virginica, Willd. Spec. iii. 56. Braehystemum lanceolatum, Willd. 

 Enum. 623. Pycnanthemum Virginicum, Pers. Syn. ii. 128. — Dry ground, Mass. and Canada 

 to Nebraska and Georgia. 



