142 



NORTH AMERICAN FLORA 



[Volume 34 



1801. Not Brotera Cass. 1799. 



1. F. trinervia. 



pappus of 5 oblong erose squamellae, 0.5 mm. long, and 5 bristles one half longer, all united 



at the base. 



Type collected on plains below San Carlos, Rio Grande, Texas, C. C. Parry (Mex. Bound. Surv.) 

 640 (herb. Columbia Univ.). 



71. FLAVERIA Juss. (Gen. 186, hyponym. 1789); J. F. Gmel. 

 Syst. Nat. 2: 1269. 1791. 



Vermifuga R. & P. Prodr. Fl. Per. 114. 1794. 

 Brotera Spreng. Jour. Bot. Schrad. 1800 2 : (189) pi. 

 Nanenbergia Willd. Sp. PI. 3: 2393. 1804. 



Glabrous or puberulent herbs. Leaves opposite, narrow, entire or dentate, sessile, often 

 more or less connate. Heads numerous, narrow, sessile or short-pedicelled, in dense cymes or 

 glomerules, which are solitary or paniculate. Involucre of 1-8 subequal bracts, and some- 

 times 1 or 2 smaller outer ones. Receptacle small, naked or setose. Ray-flowers solitary, 

 pistillate and fertile, or wanting; ligules entire, emarginate, or 3-dentate, yellow, incon- 

 spicuous. Disk-flowers 1-15, hermaphrodite and fertile; corolla-tube often glandular- or 

 villous-puberulent, longer than the campanulate or shorter than the funnelform throat; limb 

 5-lobed. Anthers obtuse at the base, with a conic appendage at the apex. Style of the 

 hermaphrodite flowers 2-parted, reflexed, obtuse. Achenes oblong, somewhat compressed, 10- 

 ribbed ; pappus wanting, or in one species of 2-4 distinct irregular squamellae. 



Type species, Flaveria chilensis Juss. 



Pappus wanting; leaves barely connate. 



Receptacle setose; involucral bracts 1 or 2; heads 1 -flowered; throat of the 



disk -corollas campanulate (Nauenbergia). 

 Receptacle naked; involucral bracts more than 2; heads 2-20-flowered, 

 except in F. anomala; throat of the disk-corollas funnelform (Eu- 

 flaveria) . 

 Involucral bracts 3, rarely 4. 

 Annuals. 



Ligule erect, narrow. 



Ligule spreading, oval or elliptic. 



Outer calyculate bracts minute or wanting; leaves 3-ribbed. 

 Outer calyculate bracts conspicuous. 



Leaves serrate, distinctly 3-ribbed; achenes 2.5-3 mm. 



long. 

 Leaves entire or remotely denticulate; achenes 2 mm. 

 long or less. 

 Inflorescence compact ; achenes nearly equal. 

 Inflorescence open; ray-achenes one-third larger than 

 the disk-achenes. 

 Perennials. 



Inflorescence much-branched, with few heads in each glomerule; 



achenes subequal. 

 Inflorescence densely corymbose; ray-achenes larger. 

 Involucral bracts 5-7. 



Bracts corky-thickened below in fruit; flowers solitary. 

 Bracts not thickened; flowers 2 or more in each head. 

 Heads 2-8-flowered. 



Plants rather simple below; lower internodes not very short; 

 leaves not fleshy; annuals. 

 Stem copiously branched above; leaves narrowly linear; 



ray-achenes larger than disk-achenes. 

 Stem rather simple; leaves lance-linear; achenes subequal. 

 Plants branched from the base; lower internodes very short; 

 leaves narrowly linear, fleshy; apparently perennials. 

 Heads 10- 15 -flowered. 



Ligules wanting; inflorescence naked. 



Leaves mostly lance-linear, pubescent on both sides. 

 Leaves narrowly linear, glabrous. 

 Ligules present; inflorescence leafy-bracted. 

 Pappus of 2-4 squamellae; leaves connate-perfoliate, broad; throat of the disk- 

 corollas elongate, funnelform (Fl A VERIOPSIS) . 



9. F. anomala. 



10. F. ramosissima. 



1 1 . F. latifolia. 



12. F. linearis. 



13. F. pubescens. 



14. F. oppositifolia. 



15. F. floridana. 



16. F. chloraefolia. 



1. Flaveria trinervia ( Spreng.) C. Mohr, Contr. U. S. Nat. Herb. 



6: 810. 1901. 



Oedera trinervia Spreng. Bot. Gart. Halle 63. 1800. 

 Brotera Conlrayerba Spreng. Jour. Bot. Schrad. 1800'-': pi. 5. 



1807. 

 Nauenbergia trinervata Willd. Sp. PI. 3: 2393. 1804. 



1801. Not Flaveria Conlrayerba Pers. 



