198 CAEDUACEAE. 



lucral bracts linear or linear-lanceolate, 5-9 nnn. long: ligules 9-17 nun. long. 

 — Everglades. 



38. PECTIS L. Slender or wiry glandular-dotted herbs. Leaves oppo- 

 site : blades narrow, usually ciliate near the base. Heads cymose. Involucre 

 narrow, few-several-flowered: bracts distinct, gland-bearing. Eay-flowers few: 

 corollas with yellow ligules. Styles pubescent. Stigmas of the disk-flowers 

 very short. 



1. P. leptocephala (Cass.) Urban. Stems or branches 8^0 cm. long, nearly 

 glabrous: leaf-blades narrowly linear, 1-3 cm. long: involucre 1-1.5 mm. thick: 

 ligules linear to linear-oblong: disk-corollas 2 mm. long. — Pinelands. — F. K. 

 {Bah., Cuba, Ant.) 



39. ERECHTITES Eaf . Annual herbs. Leaves alternate : blades toothed 

 or pinnatifid. Heads corymbose or paniculate. Involucres narrow or some- 

 what swollen at the base: bracts narrow, flat. Disk-corollas with triangular- 

 lanceolate or deltoid lobes shorter than the narrow throat. Filaments longer 

 than the anthers. Achenes ribbed. Pappus of many white bristles. 



1. E. hieracifolia (L.) Eaf. Plants 2-20 dm. taU, watery: leaf -blades spatu- 

 late-oblong to lanceolate, 5-20 cm. long, coarsely toothed, incised, or pinnatifid: 

 involucres 12-15 mm. long: bracts narrowly linear: corollas 8-9 mm. long: 

 achenes about 1.5 mm. long. — Everglades. — F. K. {Bah., Cuba, Ant.) — Fire- 

 weed. 



40. MESADENIA Eaf. Perennial herbs. Leaves alternate: blades undu- 

 late, toothed, or somewhat lobed. Heads corymbose. Involucres eylindrie to 

 cylindric-ovoid: bracts sometimes winged or keeled. Disk-corollas with linear 

 or linear-lanceolate lobes, longer than the campauulate throat. Filaments fili- 

 form. Achenes ribbed, glabrous. 



1. M. lanceolata (Nutt.) Eaf. Stems 8-15 dm. tall: blades of the cauline 

 leaves linear, narrowly lanceolate, or linear-oblong, entire or repand-denticu- 

 late: involucral bracts 8-10 mm. long: achenes about 5 mm. long. — Everglades. 

 — Indian-plantain. 



41. EMILIA Cass. Annual or perennial herbs. Leaves alternate, but 

 often mostly basal: blades entire, toothed, or lyrate-pinnatifid. Heads solitary 

 or in lax corymbs. Involucres swollen at the base: bracts in one series and 

 without accessory ones at the base. Eay-flowers wanting. Disk-corolla golden, 

 purple, or red, with a eylindrie throat and a slender tube, the lobes lanceolate. 

 Filaments slender. Achenes 5-ribbed. 



1. E. sonchifolia (L.) DC. Plants mostly 1-8 dm. tall: leaf-blades rather 

 succulent, those of the lower leaves spatulate, those of the upper leaves lanceo- 

 late to linear, auricled at the base, all sinuate-dentate: heads long-peduncled: 

 involucral bracts linear, 10-12 mm. long: corollas 9-11 mm. long: achenes 4 

 mm. long.— Pinelands and waste grounds. Nat. of the tropics. — F. K. {Ber., 

 Bah., Cuba. Ant.) 



42. CIRSIUM [Tourn.] Hill. Caulescent large herbs. Leaves alternate: 

 blades toothed, lobed, or pinnatifid, usually spiny. Heads solitary or clustered. 

 Involucre with the outer bract at least spine-tipped or spiny-margined. Fila- 

 ments mostly pubescent. Pappus of elongate capillary bristles in several 

 series. — Thistle. 



