244 COMPOSIT.E. LindJieiTTiera. 



73. LINDHEIMERA, Gray & Engelm. (Ferdinand Lindheimer, the 

 discoverer of this ueat plant, now prized in cultivation, and remarkable for its 

 colden yellow rays simulating a 5-petalous flower.) — Proc. Am. Acad. i. 47, 

 Jour. Bost. iSat. Hist. vi. 225, & PI. Lindh, ii. 225. Single species. 



L. Texana, Gray & Engelm. 1. c. At length 2 feet high from an annual root, hirsute or 

 hispid, branching above, bearing loosely cymose-paniculate usimlly slender-pedunculate 

 heads : lower leaves spatulate to cuueate-ovate, alternate, coarsely sinuate-dentate ; upper 

 ovate to ovate-lanceolate, with a broad closely sessile base, acumii^ate, commonly entire, 

 mainly opposite, tiieir edges and also the peduncles usually beset with some small tack- 

 shaped glands : ligules half-inch or more long. — Open woods and bottoms of the upper 

 Guadalupe River, &c., Texas, Lindheimer, Wriijht. 



74. ENG-ELMANNIA, Torr. &, Gray. {George Engelmann, an eminent 

 botanist, died while this volume was printing, Feb. 4. 1884, a?t. 75.) — Torr. & 

 Gray in Nutt. Trans. Am. Phil. Soc. vii. 343, & Fl. ii. 283. Angelandra, Eudl. 

 Gen. Supijl. iii. 69. — Single species, in structure nearer to Parthenium than to 

 Silp/iium. Fl. summer. 



B. pinnatifida, Torr. & Gray, 1. c. A foot or two high from a stout perennial root, 

 rougliisli-liirsute or hispid, bi-anching above, and liearing somewhat paniculately disposed 

 heads of golden-yellow flowers on mostly slender naked peduncles : leaves all alternate, 

 deeply pinuatifid ; radical and lower cauline short-petioled and their linear or oblong lobes 

 sometimes sparinglv lobulate; upper cauline sessile and with broad base: head about 4 lines 

 high: rays half-inch or more long: akene rougli-hispidulous. — Torr. in Marcy Rep. t. 11 ; 

 ^leehan, Nat. Flowers, ser. 2, i. t. 2. E. Texana, Sclieele in Linn. xxii. IS.j. — Prairies and 

 rockv hills, Arkansas and Louisiana to Texas and Arizona. (Adj. Mex.) 



75. PARTHENIUM, L. (Ancient name of some plant, from -apOevo?, 

 viroin.) — Herbaceous or suffruticose (all E. American), bitter-aromatic ; with 

 small heads of whitish flowers ; in summer. — Ga?rtn. Fruct. t. 168 ; DC. Prodr. 

 v. 531 ; Torr. & Gray, Fl. ii. 284 ; Benth. & Hook. Gen. ii. 351. 



§ 1. Partiiemastrum (Nis.sole), DC. Ligule more or less evident : caules- 

 cent, usually branching, with alternate leaves either dentate or variously lobed or 

 divided : heads corymbosely or paniculately cymose. 



* Herbaceous, with membranaceous once or twice pinuatilid leaves, and habit of Ambrosia. 

 P. Hysteroptiorus, L. A foot or two high, from an annual root, diffuse, strigosely pubes- 

 cent, sometimes also hirsute, generally green : heads in a loose and open naked panicle : 

 cauline leaves of broadly ovate outline,, pinnately parted into 5 to 9 mostly narrow again 

 pinuatifid lobes; of the flowering branches linear or lanceolate and entire or few-lobed: pap- 

 pus of 2 rather large and roundish scales. — Spec. ii. 988; Bot. Mag. t. 2275. Ar(j jrwhata 

 hipinnatijida, Cav. Ic. iv. 54, t. 378. Villannva bipinnatifida, Ort. Dec. iv. 48, t. 6. (P. lo- 

 hatum, Buckley in Proc. Acad. Philad. 1861, 457, should be this, by its "annual root," rather 

 tlian the following.) — Waste grounds, Florida to Texas, wiiere it may be indigenous, but 

 probalily iutroduced from within the tropics : also an imported ballast-weed as far north as 

 Philadelphia. (Mex., Trop. Am.) 

 P. lyratum. A foot high from a truly perennial root, canescent or cinereous •n^ith fine 

 and ck)se sometimes also loose hirsute pube.scence, erect : heads corymbosely crowded, more 

 pubescent : leaves of obovate or oblong outline, lyrately pinuatifid, the lobes short and ob- 

 long. — P. Hi/stcrophuriis, var. If/ratnm, Gray, Proc. Am. Acad. xvii. 216. — Texas, in the 

 southern and western parts, Berlandier, Lindheimer, Wriyht, Reverchon, &c. Eqtially allied 

 to the preceding species and to the Mexican P. confertum. Gray. (Adj. Mex.) 



* * Fruticose or suffrutescent, with firmer and more simply lobed leaves. 

 P. incanum, HBK. Decidedly shrubby, 1 to 3 feet high, much branched, canescent with 

 fine tomentum: leaves mostly obovate in outline, sinuately pinuatifid into 3 to 7 oblong or 



