PR0CE1 OF THE AMERICAN ACADEMY. 



a ray and envelops the ray-achene by its thin infolded usually ciliate alar 

 portions. The achenes are glabr ns and crowned with a Bhallow callous 

 cup, bul otherwise pappus] 



Although thus clearly marked, the species of tb as have from 



habital similarities been much confused with thoseof Sabazia, Galinsoga, 

 Melampodium, and Spilanthes. The following Bynopsis, drawn up dm 



.; the two new species here proposed, may therefore be found 

 il in showing the present Btatus of the group. 



Heads axillary, pedunculate, ra relatively large (including the rays 1.0 



2 cm. in diameter) : rays about 12, conspicuous, pale yellow with mor 



ilea of the involucre ciliolate, otherwise glabi 

 weak aquatic essentially glabrous perennials. 



-i- Leaves slender-petioled. 



1. J. petiolaris. Sabazia glabra, Wats. Proc. Am. Acad, xxiii. 277. 



Shallow water, pine plains, base of the Sierra Mad re. Pringle, no. 



.. The involute involucral scales enveloping the ray achenes clearly 



show this plant a Jaegeria. The transfer oi Dr. Watson's name gh 



ria is rendered undesirable by the varietal use of this designation 



under ./. hirta by Mr. Baker in the Flora Brasiliensis as mentioned 



•w. 



-t- -•- Leaves sessile, amplexicaul. 



2. J. purpurascens. 1 tecumbent stem simple or sparingly branch* d. 

 purplish, glabrous, leafy: leaves oblong-lanceolate, acute, sessile by a 



jping base, entire, glabrous, L.4 to 2 em. long, 3 to 1 mm. wide: pe- 

 duncles terete, purplish, 3 to 1.2 em. Ion-, puberulent near the summit. 

 borne in the upper axib : disk 8 mm. in diameter, hemispherical, at 

 length somewhat conical: rays 11 to 13, linear or narrowly obl< 

 purple 1 , 6 mm. long: bracts of the open flattish involucre uniseriate, ovate, 

 acute, strongly ciliate at the broadesl involute part, green and glabi 

 dorsally: disk-flowers numerous; corollas pale yellow, ■_' mm. long, gla- 

 brous except for a tomentulose ring at the base of the tube: achenes 

 glabrous, 1.7 mm. long, crowned with a narrow callous ring other',. 

 calvous: ligules pale-yellow, shading to deep purple at the tip, 5 mm. 

 long, 1.8 mm. broad. —Collected in shallow water near Durango, M. \- 

 by Dr. Edward Palmer, November. 1896, no. 8<>.~> (distributed as 

 § bazia glabra ). 



* * Heads Bolitarj and axillary (.!. prorepetu) or more often terminnl in the ! 

 of the stem, or, when Beveral, borne in leafy cymes: mere or less pubescent 

 plants of muddy shores or drier habitat : rays yellow or white. 



