392 



COMPOSITAE. 



[Vol.. III. 



1. Doellingeria umbellata (Mill.) Nees. 

 Tall Flat-top White Aster. (Fig. 3829.) 



Asfcr ii»iM/a/us Mill. Gard. Diet. Ed. S, No. 22. 176S. 

 Dip/opap/>iisu»ibe//a/usHook. VI. lior. Am. 2 22. 1834. 

 D. )imhe!/a/a Nees, Gen. & Sp. .\st. 178. 1S32. 



Stem glabrous or pubescent above, striate, 

 corymbosely branched at the summit, 2°-S° high. 

 Leaves lanceolate, to oblong-lanceolate, ascend- 

 ing, glabrous above, usually pubescent on the 

 veins beneath, membranous, acuminate at the 

 apex, narrowed at the base into short petioles, or 

 the uppermost sessile, hispid-margined, those of 

 the stem 5'-6'long, ^-'-i' wide; heads numerous, 

 6"-io" broad, in terminal compound corymbs; 

 involucre broadly campanulate or hemispheric, 

 iyi"-2" high, its bracts lanceolate, usually pubes- 

 cent or ciliale, acutish or obtuse, imbricated in 3 

 or 4 series, the outer shorter; rays 10-15, white; 

 style-appendages ovate, acute; pappus nearly 

 white; achcncs nerved, slightly pubescent. 

 * In moist soil, Newfoundland to Georgia, west to the 



Northwest Territory, Micliigati and Arkansas. July-Oct. 



Doellingeria umbellata piibens (A. Gray) Britton. 



Aster unibellalus var. pubens A. Gray. Syn. Fl. i: Part 2, 197. 1SS4. 



Under leaf-surfaces pubescent. Michigan to the Northwest Territory. 



2. Doellingeria humilis (Willd.) Britton. 



Broad-leaved Flat-top White Aster. 



(Fig. 3830.) 



Aster humilis Willd. Sp. PI. 3: 203S. 1804. 



D. aniygdalina Nees, Gen. & Sp. Ast. 179. 1832. 



Aster umbellatus var. lati/olius h.. Gray, Syn. Fl. i: 



Part 2, 197. 1S84. 



Similar to the preceding species, usually lower, 

 seldom over 4° high. Stem striate, corymbosely 

 branched above, glabrous, or somewhat pubescent. 

 Leaves ovate to ovate-lanceolate, rather firm, ses- 

 sile, or the lower very short-petioled, acute or 

 short-acuminate at the apex, narrowed, or some- 

 times rounded at the base, rough-margined, those 

 of the stem i'-3' long, }z'-2' wide, inflorescence 

 as in D. umbellata ; pappus dirty white; achenes 

 somewhat pubescent. 



In moist soil, southern New Jersey and Pennsylva- 

 nia to Florida and Texas. July-Sept. 



3. Doellingeria infirma (Michx. ) 



Greene. Cornel-leaved Aster. 



(Fig. 3831.) 



Aster in/irmiisMichK. Fl. Bor. \m. 2: 109. 1S03. 

 Diplopappus corni/olius Less, ;Darl. Fl. Cestr. 



474- 1837. 

 D. tnfirma Greene, Pittonia, 3: 52. 1896. 



Stem slender, glabrous, or roughish above, 

 sparingly branched at the simimit, terete, 

 i^°-3° high. Leaves entire, hispid-mar- 

 gined, glabrous above, sparingly hispid on 

 the veins beneath, the lower obovate, small, 

 obtuse, usually sessile, the upper larger, ob- 

 long-lanceolate, acute, 2'-5' long, I'-i^' 

 wide; heads few, about 1' broad, in a diver- 

 gently branched terminal corymbose cluster; 

 involucre broadh- campanulate, 2"-3" high, 

 its bracts oblong-lanceolate,obtuse, sparingly 

 pubescent, imbricated in about 4 series, the 

 outer much shorter; rays S-15, white; style- 



appendages subulate; pappus tawny; achenes nerved, glabrous. 



In dry, usually rocky soil, Massachusetts to New York, Pennsylvania and Tennessee. 



Aug.-Sept. 



