226 COMPOSITyE. Flachea. 



one of De Candolle's, which continues the principal Linnsean specific name, is to 

 be preferred. Gonyza Carolinensis, Jacq., is Pluchea odorata, wrongly attrib- 

 uted to Carolina. 



P. bifrons, DC. Stems nearly simple, 2 or 3 feet high from a perennial root : leaves veiny, 

 acutely denticulate, from oblong to lanceolate, commonly obtuse at both ends (2 to 4 inches 

 long), partly clasping or closely aduate-sessile : lieads glomerate in leafy-bracted sessile 

 clusters : involucral bracts lanceolate. — Prodr. 1. c. ; Torr. & Gray, Fl. ii. 260, excl. syn. L. ! 

 Baccharis fatida, L. Spec. 8G1, as to pi. Gronov. B. viscosa, Walt. Car. 202. C'oni/za 

 hifrons, Pursh, Ell. 1. c, &c., not L. C. amplexicaalis, Michx. Fl. ii. 126. C. uliginosa, Pers. 

 Syn. ii. 427. — Wet soil, Cape May, New Jersey, and through the hjw country to Keys of 

 Florida (where is a very narrow-leaved variety, Coni/za amjustlfolla, Nutt. Jour. Acad. 

 Pliilad. vii. 109 ?), and Texas. ( W. Ind.) 



P. camphorata, DC. Stems 2 to 5 feet high from an annual (not perennial) root: leaves 

 from ol)long-ovate to oblong-lanceolate, acute or acuminate at both ends, denticulate or den- 

 tate (.3 to 8 inches long), the larger distinctly or indistinctly petioled ; primary veins often 

 evident, but veiulets obscure : heads numerous and crowded in naked convex or coiymbiform 

 cymes, commonly short-pedicelled : involucral bracts from ovate to lanceolate, often tinged 

 with purple. — Erigeron camjthoratian, L. Spec. ed. 2, 1212 (Gronov. Virg. ed. 1,^6, Clayt. 

 no. 165). Baccharis fietida, L. Spec. ed. 1, 861, as to syn. Dill., not as to Gronov. Conijza 

 Marilandica, etc., Dill. Elth. t. 88, fig. 104, & C. Americana frufescens, etc., Dill. 1. c. t. 89. 

 C. Mari/landica, Michx. 1. c. C. Marilandica & C. camphorata, Pursh, Fl. ii. 523 ; Ell. 1. c. 

 Gifnema dentata, viscida, &c., Raf. Ann. Nat. 159. Pluchea Marilandica & P. petiulata, 

 Cass. Diet. I.e. P. Marilandica, fatida, camphorata, also (W. Ind.) P. purpurascens & P. 

 glabrata? DC. I. c. P. fatida, camphorata, & purpurascens, Torr. & Gray, Fl. ii. 261. — Salt 

 marshes and moist saline soil, Mass. to Florida, Texas, Arizona, and coast of California: in 

 shady places or less saline soil, with leaves thinner and more petioled, and involucre almost 

 glabrous, wlieu it is P. petiolata, Cass. (Adj. ]\Iex., W. Ind.) 



53. PTEROCAtTLON, Ell. Black-root. (Urepov, wing, and KavXo?, 

 stem.) — Mostly perennial herbs, the typical species American ; with one excep- 

 tion all tomentose-canescent except the upper face of the sessile pinnately veined 

 leaves, these decurrent on the whole stem, forming wings ; small sessile heads 

 spicate at the summit of the stem and virgate branches ; the flowers usually white 

 or whitish, in summer. — Ell. Sk. ii. 323 ; DC. Prodr. v. 453. C/icenoIobus, Cass. 

 Diet. Sci. Nat. xlix. 348. 



P. pycnostachyum, Ell. 1. c. Eoots fasciculate and tuber-like or fusiform, black : .stem 

 2 feet high, mostly simple : leaves from oblong to lanceolate, minutely denticulate : heads 

 crowded in a dense and continuous spiciforni naked thyrsus (of 3 to 8 inches in length) : in- 

 volucre lauate-tomentose. — Torr. & Gray, Fl. ii. 2C2. Conj/za pycnostachija, Michx. Fl. 

 ii. 126. Chtnolobus pi/cnostachyus, Cass. 1. c. Gnaphalium undulatum, Walt. Car. 203. — 

 Dry pine barrens, near the coast, N. Carolina to Florida. 



P. virgatum, DC. Root fusiform and fibrose (i)erhaps Isiennial) : stem slender, simple or 

 witli virgate branches : leaves linear and very acute, entire, or the lower cauline lanceolate 

 and obscurely serrulate, the venation hardly apparent : lieads narrow, in separated glomer- 

 ules ; these forming a virgate and elongated interrupted spike-like inflorescence : involucre 

 appressed-tomentose, or the subulate inner bracts glabrate. — Prodr. v. 454. Gnaphalium 

 virgatum, L. Amoen. Acad. v. 405. Conyza virgata, L. Spec. ed. 2, 1206, with syn. 

 Chcenolobus virgatus, Cass. I.e. — Open pine woods near Houston, Texas, Lindhdmer. (W. 

 Ind., Mex.) 



54. MiCROPUS, L. (MiKpo's, small, ttou?, foot, the soft-woolly small 

 heads or clusters like Leontopodium, or Lion's-foot, on a small scale.) — Low 

 floccose-woolly annuals, with alternate entire leaves, belonging to the Old World, 

 except our Pacific coast species. — Gcertn. Fr. t. 164; Schkuhr, Handb. t. 267; 



