COMPOSITAE. 



VOL. III. 



2. Pluchea camphorata (L.) DC. Spicy or 

 Salt-marsh Fleabane. Fig. 4391. 



Erigeron camphoratum L. Sp. PI. Ed. 2, 1212. 1763. 

 Conysa marilandica Michx. Fl. Bor. Am. 2: 126. 1803. 

 Pluchea camphorata DC. Proclr. 5: 451. 1836. 



Root annual ; stem usually branched, finely viscid- 

 puberulent, or nearly glabrous, 2-3 high, somewhat 

 channeled. Leaves ovate, oblong or lanceolate, pu- 

 berulent or glabrous, acute or acuminate at the 

 apex, narrowed at the base, short-petioled, or the 

 upper sessile but not clasping, 3'-8' long, i'-3' wide, 

 serrate or denticulate, not conspicuously reticulate- 

 veined; heads about 3" high, rarely leafy-bracted, 

 mostly in naked open corymbiform cymes; bracts 

 of the involucre ovate-lanceolate, or lanceolate, 

 acute, puberulent; flowers purplish; achenes pubes- 

 cent. 



In salt marshes, coast of Massachusetts to Florida, 

 Texas and Mexico. Called also ploughman's-wort. 

 Aug.-Oct. 



3. Pluchea petiolata Cass. Inland Marsh Flea- 

 bane. Fig. 4392. 



Pluchea petiolata Cass. Diet. Sci. Nat. 42 : 2. 1826. 

 Pluchea foetida DC. Prodr. 5 : 452. 1830. 



Similar to the preceding species, but glabrate, darker 

 green, usually taller, 2*-4 high, the stem stout, rather 

 strongly channelled. Leaves ovate-lanceolate to oval, 

 thin, 4'-io' long, ii'~3' wide, mostly acuminate at the 

 apex, cuneate-narrowed at the base, long-petioled, ir- 

 regularly serrate ; petioles of the larger leaves 8"-i2" 

 long; heads 2."-2\" high, in terminal and often also 

 axillary clusters; bracts of the involucre granular, cil- 

 iate; achenes short-pubescent. 



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

 nois, Missouri and Oklahoma. Aug.-Oct. 



43. ANTENNARIA Gaertn. Fruct. & Seni. 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. Involucre 

 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 pappus 

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

 mostly S-toothed corollas, 2-cleft style, and copious pappus of capillary naked bristles, slightly 

 united at the base, the style often crimson. Achenes oblong, terete, or slightly compressed. 

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



About 50 species, natives of the north temperate zone and southern South America. In addi- 

 tion to the following, many others occur in the western parts of North America. The patches of 

 fertile and sterile plants are usually quite distinct, and the sterile plants of some species are much 

 less abundant than the pistillate. Perfect achenes are, however, abundant, parthenogenesis being 

 a known feature of this genus. Type species : Antennaria dioica (L.) Gaertn. 



