Genus 42.] 



THISTLE FAMILY. 



397 



3. Pluchea petiolata Cass. Inland Marsh 

 Fleabane. (Fig. 3841.) 



Pluchea petiolata Cass. Diet. Sci. Nat. 42: 2. 

 Pluchea fact i da DC. Prodr. 5: 452. 1830. 



1826. 



Similar to the preceding species, but glabrate, usu- 

 ally taller, 2}4-4 high, the stem -stout, rather 

 strongly channelled. Leaves ovate-lanceolate to 

 oval, thin, 4 / -io / long, iJ^-3' wide, mostly acumi- 

 nate at the apex, cuneate-narrowed at the base, long- 

 petioled, irregularly serrate; petioles of the larger 

 leaves 8 // -i2 // long; heads 2 // -2j- 2 ' // high, in terminal 

 and often also axillary clusters; bracts of the involu- 

 cre granular, ciliate; achenes short-pubescent. 



In moist soil, often in woods, Virginia to Florida, Illi- 

 nois, Missouri and the Indian Territory. Aug.-Oct. 



43. ANTENNARIA Gaertn. Fruct. & Sem. 2: 410. pi. 167. 1791.* 

 Perennial woolly dioecious or polygamo-dioecious herbs, with alternate and basal leaves, 

 and small discoid many-flowered heads usually capitate, glomerate or corymbose. Involu- 

 cre oblong, ovoid or campanulate, its bracts scarious, imbricated in several series, the outer 

 shorter, usually woolly. Receptacle convex, or nearly flat, foveolate, not chaffy. Staminate 

 flowers with a truncate or minutely dentate corolla, usually undivided style and scanty pap- 

 pus of club-shaped smooth or minutely barbed bristles. Pistillate or perfect flowers with 

 tubular mostly 5-toothed corollas, 2-cleft style, and copious pappus of capillary naked bris- 

 tles, slightly united at the base. Achenes oblong, terete, or slightly compressed. [Latin, 

 in allusion to the fancied resemblance of the sterile pappus to insect antennae.] 



About 36 species, natives of the north temperate zone and southern South America. In addition 

 to the following, about a dozen others occur in the western parts of North America, and one in the 



southern states. 



re- Pappus-bristles of sterile flowers with club-shaped or dilated tips. 



| Plant not stoloniferous; basal leaves oblanceolate. 1. A. Carpathica. 

 tt Plants stoloniferous, growing in patches. 

 Basal leaves 4"-i^' long, i^"-6" wide, i-nerved, or indistinctly 3-nerved. 



Involucral bracts of fertile heads dark brownish green, lanceolate, acute or acuminate; plant 



1 '-4' high. 2. A. alpina. 



Involucral bracts all light green, or light brown, with white or pinkish scarious tips. 

 Bracts all elliptic or oblong, mostly obtuse; plant 2 ( -8' high. 3. A. dioica. 



Bracts of fertile heads lanceolate, mostly acute. 



Basal leaves spatulate, petiole distinct; fertile plant about 1 high. 4. A . neodioica. 

 Basal leaves obovate or oblanceolate, without distinct petioles. 



Stem of fertile plant slender, about i high; stolons long and slender; basal leaves 



oblanceolate. 5- A. neglecta. 



Stems all stout, 2'-6' high; stolons short; basal leaves obovate. 



6. A. campestris. 

 Basal leaves mostly more than \%' long and %' wide, distinctly 3-nerved. 7. A. piantaginifolia. 

 % -X- Pappus-bristles of sterile flowers not dilated, barbellate; plant about i' high, tufted; head solitary. 



8. A. dimorpha, 



i. Antennaria Carpathica (Wahl.) Hook. 

 Carpathian Everlasting. (Fig. 3842.) 



Gnaphalium CarpathicumWahl. Fl. Carp. 258.pl. 3. 1814. 

 Antennaria Carpathica Hook. Fl. Bor. Am. 1: 329. 1833. 



Plant floccose-woolly throughout, not stoloniferous; stem 

 2 / -io / high, simple. Basal leaves oblanceolate or oblong, 

 obtuse or acutish at the apex, narrowed at the base into short 

 petioles, i / -2 / long, 2 // -4 // wide; stem-leaves linear, acute or 

 acutish, erect, the upper gradually smaller; heads in a term- 

 inal subcapitate cluster, or rarely solitary, 2^ // -3 // broad; in- 

 volucre 2 // -3 // high, woolly at the base, its bracts brownish 

 purple, the inner ones of the fertile heads mostly acutish, 

 those of the sterile heads mainly obtuse. 



In dry soil, Labrador and Anticosti to Hudson Bay. Also in 

 Europe and northern Asia. May-Sept. 



*Text contributed by Mr. P. A. Rydberg. 



