Pijcnanthemum. LABIATE. 355 



H 1— Leaves from lanrcolatc to ovafc sessile, or almost so, denticulate or sometimes entire, pin- 



natuly veined : Hower.s in larger and tower less dense heads: \ crlieillastrateglumerules suljtended 

 by fewer and looser bracts. 



P. Calif ornicum, Torr. Usually tomentosc-canescent, rather stout: leaves ovate- 

 lanceolate or ;iltiiost ovate, with rounded or subcordate sessile base; glonierules terminal 

 and in the axils of 2 or 3 uppermost pairs of leaves, at first very dense (0 to 12 lines in 

 diameter): bracts setaceous, lax: teeth of the calyx lanceolate-triangular, villous, 3 or 4 

 times shorter than the cylindraceous tube. — Jour. Acad, riiilad. n. ser. ii. 9t>, & Pacif. II. 

 Hep. ir. 122; Gray, Bot. Calif, i. 51)2. Califoi-nia and borders of Nevada. Passes into 



Var. glabellum, not canesccnt : leaves and stems from pubescent to almost glabrous : 

 inflorescence k ss dense. — Torr. 1. c. — Upper Sacramento, Bigdow, Brewer, &c. 

 P. muticum, Pers. 1- c. Puberulent, cinereous-pubescent, or glabrate but pale, much 

 branched : leaves from lanceolate to ovate, subsessile, rather rigid, eonunonly obtuse at 

 base; those subtending the (sometimes proliferous) dense capitate glonierules canescent : 

 calyx-teeth ovate-deltoid or triangular-lanceolate, acute. — Brack i/stciitum muticuiii, Michx. 

 Fl. ii. 6, t. 32. Pi/c. Arkdnsamun, Fresenius in Kegensb. Flora, 1842, 32.5. — Maine to Flor- 

 ida and Arkansas. — Brachijstemum verticillulum, Michx. 1. c. t. 31 (coll. at Pittsburgh, Penn.), 

 is intermediate between the typical (eastern) jilant, with short bracts, shorter and broader 

 calyx-teeth, and leaves glabrate or minutely cinereous, and 



Var. pilosum. Cinereous with looser pubescence : leaves thinner, oblong-lanceolate, 

 mostl}' acute or aeutish at base, sometimes ovate (Mempliis, Fendler) : bracts and especially 

 the rather narrower calyx-teeth canescent with more copious often villous pubescence. — 

 P. piloaum, Xutt. Gen. ii. 33; Gray, 1. c. — Ohio to Illinois and Arkansas. — Caly.x often 

 (but inconstantly) somewhat unequal, two or three of the teeth more united. 

 P. leptodon. iSoft-pubescent, or glabrate below, loosely branched, tall : leaves mem- 

 branaceous, green (li} or 2 inches long), lanceolate or oblong-lanceolate, subsessile : gloni- 

 erules larger and looser than in the preceding, canescent-hirsute : long-acuminate bracts 

 and calyx-teeth slender-subulate, villous-hirsute. — P. jnlosnm, var. ? leptodon, Gray in Am. 

 Jour. Sci. 1. c. — North-western N. Carolina and S. Missouri, Grai/ & Carey, Gei/cr. — Per- 

 haps a hybrid between P. muticum, var. pilosum, and P. Tullia, var. dubium. 



-1— -I— -1— Leaves linear- or oblong-lanceolate, short-petiolcd, not even the upjierniost canescent: 

 flowers in mostly terminal cajiitate glonierules, which are dense even in fruit: calyx almost or quite 

 equally 5-toiitlK'd, canesccnily pubescent, the teeth subulate. (Ambiguous species.) 



P. Torreyi, Bentll. Puberulent : stem strict, cor^'mbose at summit ; leaves narrowly 

 lanceolate, green, glabrate, entire or slightly and sparingly denticulate: heads cymose- 

 corymbed, small; the bracts subulate, mostly appressed : corolla rather large. — Prodr. 

 1. c. 188. P. Vir(jinicum, Nutt. Gen. 1. c. 1 — Dry ground, S. New York to Pennsylvania. 



P. clinopodioides, Gray, I.e. Pubescent: leaves broadly or oblong-lanceolate, sharply 

 denticulate or sometimes entire: heads fewer and larger: bracts loose. — Dry soil, S. New 

 York to E. Pennsylvania. 



* * * Calyx distinctly bilabiate through the union of three teeth to form the upper lip: the teeth 

 and the tips of the loose iiracts if slender not rigid: (lowers in dense ilaltened glomerate cymes, 

 wiiiih are usually expanded with age: leaves membranaceous, mostly serrate, distinctly petioled, 

 the uppermost more or less canescent: stems loosely branching. 



P. Tullia, Benth. Rather stout, loosely more or less pubescent : leaves ovate- or lanceo- 

 late-oblong, acmninate, obtuse or aeutish at base, somewhat serrate, thin (2 to 4 inches 

 long), pale green both sides, only the uppermost tomentulosc-whitened : calyx-teeth aristi- 

 foriu-subulate, equalling the tube in length, above and the long-attenuate tips of the bracts 

 setose-barbate. — Lab. .328, & in DC. I. c. i. 87. Tullia Pijcnanthemoides, Leavenworth in 

 Am. Jour. Sci. xx. 24-3, t. 5. — S. Virginia and N. Carolina to Tennessee and Georgia, 

 chiefly in and near the mountains. 



Var. dubium. Greener, not canescent, except the setose-villous bracts and calyx ; 

 the teeth of the latter shorter than the tube: leaves lanceolate. — P. dubium, Gray, I. c. — 

 Ashe Co., N. Carolina, Grajj & Carey. Perhaps a hybrid between P. Tidlia and P. leptodon, 

 or even P. mulinnn, var. pilosum. 



P. incanum, Michx. 1. c. Cinereous-pubescent: leaves ovate-oblong, with obtuse or 

 rounded base, serrate (2 to 4 inches long), the lower surface or both surfaces of the upper- 

 most canescent, at least when young, and with more or less loose or villous pubescence; 

 calyx-teeth subulate or triangular-lanceolate and cuspidate or pointed, not exceeding half 



