ROBINSON. — JAEGERIA AND RUSSELIA. $15 
abruptly into a slender acuminate appendage. — Collected by C. & E. 
Seler, near Xochicato, Cuernavaca, 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- 
diflora, DC., D. serratifolia, DC., D. integrifolia, Gray, and D. squam- 
mosa, Gray. From all these it is readily distinguished by its glandless 
, nvolucre 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 5-6-flowered, terminating the ultimate branchlets on either short 
or elongated peduncles: involucre 2 to 2.8 em. 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, Pl. 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 Z. ramosissima resembles most 
closely Z. juncea, Don, but from this species it is readily distinguished 
by the size of the heads. From ZL. 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. Rosryson. 
Tue Genus JAEGERIA. 
Tae 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 
