ROBINSON. — JAEGERIA AND RUSSELIA. 315 



abruptly into a slender acuminate appendage. — Collected by C. & E. 

 Seler, near Xochicato, Cueruavaca, Mexico, December, 1887, no. 410, 

 also near the Hacienda S. Gaspar in the same region, 18 December, 

 1887, no. 317. The affinity of this species appears to be with D. gran- 

 dijlora, DC, D. serratifolia, DC, D. integrifolia, Gray, and D. squam- 

 mosa, Gray. From all these it is readily distinguished by its glandless 

 involucre with larger herbaceous outer scales. Type specimens are pre- 

 served in the Royal Botanical Museum, Berlin. 



Lygodesmia ramosissima. Much branched from a perennial base ; 

 branches striate-angled, glabrous, somewhat junciform, not spinescent: 

 leaves linear to subulate-linear, 0.5 to 7 cm. long, entire or remotely den- 

 ticulate, occasionally with more conspicuously spreading teeth, glabrous : 

 heads o-6-flowered, terminating the ultimate branchlets on either short 

 or elongated peduncles : involucre 2 to 2.3 cm. long, the outer calyculate 

 bracts ciliate, the inner bordered by a hyaline margin and bearing near 

 the apex a keel-like appendage : mature achenes subterete, smooth and 

 glabrous, about 1.5 cm. long; pappus nearly or quite equalling the 

 achenes, tawny. — Lygodesmia juncea, Gray, PI. Wright, i. 129, not Don. 

 — Collected by Charles Wright on the expedition from western Texas to 

 El Paso, prairies of the Pecos River, August, 1849, no. 417; by C G. 

 Pringle on plains near the city of Chihuahua, Mexico, 18 August, 1885, 

 no. 578 and by E. W. Nelson, between Ramos and Inde, Durango, 11 to 

 14 August, 1898, no. 4710. In habit L. ramosissima resembles most 

 closely L. juncea, Don, but from this species it is readily distinguished 

 by the size of the heads. From L. aphylla, DC, and its variety, our 

 plant is at once separated by the copiously branched stems. 



IL — SYNOPSES OF THE GENERA JAEGERIA AND 



RUSSELIA. 



By B. L. Eobinsox. 



The Genus Jaegeria. 



The small helianthoid genus Jaegeria, inhabiting muddy shores and 

 shallow pools of tropical America, is exceedingly well marked by its non- 

 imbricated involucral bracts. These are similar to each other in form 

 and are equal in number to the rays, in fact each stands just in front of 



