244 COMPOSITE. Lindheimera. 



73. LJNDHEiMER/A, 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. ilist. vi. 225, & PL Lindh. ii. 225. Single species. 



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

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

 heads : knvcr leaves spatulute to cuueate-ovate, alternate, coarsely sinuate-dentate ; upper 

 ovate to ovate-lanceolate, with 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 liiver, &c., Texas, Lindheimer, Wriyht. 



74. ENG-ELiMANNIA, Torr. & Gray. ( George Engelmann, an eminent 

 botanist, died while this volume was printing, Feb. 4, 1884, 33 1. 75.) - -Torr. & 

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

 Gen. Suppl. iii. G9. Single .species, in structure nearer to Parthenium than to 

 Silpltium. Fl. summer. 



E. pinnatifida, TORR. & GRAY, 1. c. A foot or two high from a stout perennial root, 

 roughish-liirsute or hispid, branching above, and bearing somewhat paniculately disposed 

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

 deeply pinnatifid ; 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: ravs half-inch or more long: akene rough-hispidulous. Torr. in Marcy Rep. t. 11 ; 

 Meeban, Xat. Flowers, ser. 2, i. t. 2. E. Texana, Scheelc in Linn. xxii. 155. Prairies and 

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



75. PAR/THENIUM, L. (Ancient name of some plant, from 7ra 

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

 small heads of whitish flowers ; in summer. Grertn. Fruct. t. 1G8 ; DC. Prodr. 

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



1. PAKTiiENiXsTKUM (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 pinnatifid leaves, and habit of Ambrosia. 



P. Hysterophorus, 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 

 pinnatifid 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. Argyrochceta 

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

 batum, Buckley in Proc. Acad. Philad. 1801, 457, should be this, by its "annual root," rather 

 than the following.) ^Vaste grounds, Florida to Texas, where it may be indigenous, but 

 probably introduced 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 with fine 

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

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

 long. P. Hysterophorus, var. lyrattim, Gray, Proc. Am. Acad. xvii. 21 G. Texas, in the 

 southern and western parts, Berlandicr, Lindheimer, Wriylit, flcverchon, &c. Equally allied 

 to the preceding species and to the Mexican P. confcrtum, 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 tomeutum : leaves mostly obovate in outline, siuuately piunatifid into 3 to 7 oblong or 



