ROBINSON.— DIAGNOSES ETC. OF SPERMATOPHYTES. 517 
1.2 cm. longis ca. 2 mm. latis obtusiusculis; achaeniis 7.3 mm. 
longis subfusiformi-columnaribus griseis glanduloso-hispidulis; pappi 
setis laete albis 1.2 em. longis tenuissimis levissime scabratis numero- 
sis.— Limestone ledges, Iguala Cafion, near Iguala, Guerrero, Mexico, 
altitude 760 m., 28 December, 1906, C. G. Pringle, no. 13, 921 (type, 
in Gray Herb.). The broadly winged stems would seem to place this 
species near 7’. pterocaulis Robinson & Greenman and 7’. alata Don. 
The former, however, has the bractlets of the outer involucre shorter 
than the scales of the inner involucre, leaves subentire, etc., while in 
T. alata Don the bractlets of the outer involucre are ovate-lanceolate 
and acuminate. The long obscure 7’. michuacana LaLav. & Lex., 
which from the original description would appear to have some points 
im common and might well be found in the same region, is said to have a 
herbaceous stem and a thyrsiform inflorescence nearly a foot 
ong. . 
Launaea Picridioides (Webb.), |. c., comb. nov. Rhabdotheca 
meridioides Webb. in Hook. Nig. Fl. 146 (1849). 
