354 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Bracts 9 to 18, reflexed in fruit, not keeled or conspicuously nerved, 

 lanceolate or linear-lanceolate; bristles several to many times as 

 long as the scales and twice as long as the achene or more. 

 Annuals; pappus of 5 round or obovatc, rather conspicuous scales 



and 5 or 10 bristles 2. Krigia. 



Perennials; pappus of 10 to 15 minute, oblong or linear scales and as 



many or more bristles 3. Cynthia. 



1. CYMBIAgen. nov. 



Krigia section Cymbia Torr. & Gr. Fl. N. Amer. 2: 467. 1843. 



Annual acaulescent herbs, glabrous or glandular-hispid, with rosettes of thin, gla- 

 brous or pubescent leaves, from the midst of which rise numerous scapes bearing heads 

 of ligulate flowers; bracts of the involucre 5 to 8, strongly keeled and nerved, ovate or 

 lance-ovate, acute, erect in age; disk naked; achenes striate, turbinate, glabrous; 

 pappus in two series, the outer row of broad, thin, obovate scales, the inner of usually 

 the same number of bristles, these mostly about twice as long as the scales, seldom or 

 never longer than the achene, the bristles alternate with the scales. 



A single species, the type of the genus being Krigia occidentalis Nutt. 



The characters given in the key to the genera show the principal differences between 

 this proposed genus and Krigia and Cynthia, differences which are believed to be 

 great enough to make it desirable to separate this genus from those older ones. 



1. Cymbia occidentalis (Nutt.) Standley. 



Krigia occidentalis Nutt. Journ. Acad. Phila. 7: 104. 1834. 



Krigia nervosa Hook. Icon. PI. 237. 1840. 



Krigia occidentalis mutica Torr. & Gr. Fl. N. Amer. 2: 468. 1843. 



Krigia bcllidioides Scheele, Linnaea 25: 257. 1853. 



Adopogon occidentals Kuntze, Rev. Gen. PI. 304. 1891. 



Type locality: "In Arkansas, near Fort Smith." 



Distribution: Arkansas to Missouri, southeastern Kansas, Oklahoma, and central 

 and eastern Texas. 



The subspecies mutica was simply a form with "bristles of inner pappus altogether 

 wanting. " It is scarcely separable even as a subspecies, for the bristles very often fall 

 when the achenes are mature. 



The type of Scheele's species was collected on "Galveston Island, auf feuchtem 

 Muschelsand ; Romer legit. Aprili 1846." It was said to have white heads, and pappus 

 two or three times as long as the achene ; the achenes were said to be five-angled . This 

 might be a distinct species with these characteristics, but the specimens I have seen 

 from Galveston Island differ in no way from the typical form. Upon this species 

 Scheele founded the section Bellidion of the genus Krigia. 



2. KRIGIA Schreb. 



Krigia Schreb. Gen. PI. 532. 1791. 



1. Krigia virginica (L.) Willd. Sp. PI. 3 : 1618. 1804, 

 Jlyoscris virginica L. Sp. PL 809. 1753. 

 Jlyoscris caroliniana Walt. Fl. Carol. 194. 1788. 

 Hyoseris? ramosissima Bart. Fl. Phila. Prodr. 75. 1815. 

 Krigia caroliniana Nutt. Gen. N. Amer. PI. 2: 126. 1818. 

 Krigia dichotoma Nutt. Gen. N. Amer. PI. 2: 127. 1818. 

 Krigia tenella Reichenb. Icon. Bot. pi. 87. 1830. 

 Krigia petiolaris Raf. New Fl. N. Amer. 4: 86. 1836. 

 Krigia leptophylla DC. Prodr. 7: 88. 1838. 

 Krigia virginica dichotoma A. Gray. Man. 246. 1848. 

 Adopogon carolinianum Britton, Mem. Torrey Club 5: 346. 1894. 



