of the Class Composite. 181 
In Mexico. Sesse et Mocinno. y . 
Herba perennis, cespitosa, glabra. Radix fusiformis. Caules 
plures ex eadem radice, erecti, spithameei, filiformes, uni- 
flori, læves, folio unico, lanceolato, integerrimo, sessili ad 
medium v. pauló infrà, inde squamis aliquot lineari-setaceis 
muniti, apicem versus pubescentes. Folia radicalia plu- 
rima, sessilia, linearia, acuminata, glabra, integerrima, v 
nunc subruncinata, dentibus paucis, magnis, retrorsis in- 
structa, 2—3-uncialia, sesquilineam lata. Flores citrini, 
parüm minores. Involucrum simplici serie 12-phyllum, 
cylindraceum, glaucum, tenuissimé pubescens, unguicu- 
lare, basi squamis pluribus (8—10) lineari-setaceis, patulis, 
apice nigricantibus | munitum : foliolis linearibus, membra- 
 naceis, sub apice tuberculo. auctis. © Receptaculum | nudum. 
Ligule 5-dentate, 6-nervize, involucro feré dupló longiores. 
Anthere cristà ovali membranaceà coronate, basi biden- 
ticulatæ. Stigmata brevia, crassiuscula, lineari-lin ingulata, 
: ' - : x AEIL LI 
"ati in TS : 
The simple polyphyllous ibvolücram; independent oF any 
other character, is alone sufficient to distinguish Chondrilla from 
Lactuca, its nearest ally. To the normal group of the genus, 
besides Chondrilla juncea of Linnzus, belong Chondrilla latifolia 
and graminea of the * Flora T'aurico-Caucasica," and a fourth 
species contained in the Pallasian herbarium, marked ** Pre- 
nanthes nova," and which possibly may prove to be the Pre- 
nanthes aspera of Schrader a ue Wil c liiig able 
that Chondrilla 1 eviga ' Pursh may | rd abı 
species of this genus, as the descr paon appears to dicate an 
intimate affinity to C. Sesseana above described. 
