244 COMPOSIT.E. Lindheimera. 



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

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

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

 Jour. Bost. Nat. Hist. vi. 225, & PL Lindh. ii. 225. Single species. 



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

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

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

 ovate to ovate-lanceolate, Avitli a broad closely sessile base, acuminate, commonly entire, 

 mainly opposite, their 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 Eiver, fcc, Texas, Lindheimer, W right. 



74. ENGELMANNIA, Torr. & Gray. {George Engelmann, an eminent 

 botanist, died while this volume was printing, Feb. 4, 1884, ajt. 75.) — ^^Torr. & 

 Gray in Nutt. Trans. Am. Phil. Soc. vii. 343, & Fl. ii. 283. Atir/elandra, Endl. 

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

 Silphium. Fl. summer. 



- E. pinnatiflda, Tokk. & Gray, 1. c. A foot or two high from a, stout perennial root, 

 roughish-hirsute or hispid, branching above, and bearing 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 sparingly lobulate ; upper cauline sessile and with broad base : head about 4 lines 

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

 Meehan, Nat. Flowers, ser. 2, i. t. 2. E. Te.ranu, ^^clieele in Linn. xxii. 15.5. — Prairies and 

 rocky hiUs, Arkansas and Louisiana to Texas and Arizona. (Adj. Mex.) 



75. PARTHENIUM, L. (Ancient name of some plant, from Trap^era?, 

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

 small heads of whitish flowers ; in summer. — Gsertn. Fruct. t. 168 ; DC. Prodr. 

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



§ 1. PAETHExiisTKUM (Nissole), 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 phmatifid leaves, and habit ot Ambrosia. 

 P. Hysterophorus, L. A foot or two high, from an annual root, diffuse, strigoscly 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. Argijrochaia 

 biplnnatifida, C'av. Ic. iv. 54, t. 378. Vilhtimra bipinnatifida, Ort. Dee. iv. 48 t. 6. (P. lo- 

 batum. Buckley iu Proc. Acad. Philad. 1861, 457, should be this, bv its "annual root," rather 

 than the following.) — Waste grounds, Florida to Texas, where 'it ma v be indigenous but 

 probably mtroduced from within the tropics : also an imported ballast-weed as far north as 

 Philadelphia. (JIcx., Trop. Am.) 



P. lyr^tum. A foot high from a truly perennial root, caneseont or cinereous with fine 

 and close sometmies also loose hirsute pubescence, erect : heads corymbosely crowded, more 

 pubescent: leaves of ob..vate or oblong outline, Ivratelv pinuatifid, the lobes short and o]^ 

 long. — P. Hysterophurns, var. If/mtum, Grav, Proc. Am. Acad. xvii. 216. — Texas in the 

 southern and western parts, /Jrrla.ndier, Lindh. imer, ]Vn,,hl. Nrnrrhon, &c. Equally allied 

 to the precedmg species and to the Mexican P. ronf,;i„m, Gray. (Adj. Jlcx.) 



* * Fniticose or suffrutcsoeiit, with firmer and more simply lobed leaves. 



P. incanum, HBK. Decidedly sliruhby, 1 to 3 feet higli, much branehcl, canescent with 

 tine tomentum : leaves mostly obovate in outline, sinuately pinuatifid iuto 3 to 7 oblong or 



