COMPOSITZA. 119 
2. Distasis ? heterophylla, Hemsley, n. sp. 
Perennis, nana, multicaulis, foliis sessilibus angustis integris trifidis vel pinnatifidis, capitulis sub- 
globosis terminalibus multifloris, involucri bracteis fere equalibus, ligulis minimis angustissimis, 
acheniis immaturis pilosulis, pappi paleis 4-5 laceratis, seta O vel 1 (1-3 ex Benth. et Hook.). 
Herba perennis, basi suffruticosa, multicaulis, caulibus in exemplari Coulteriano unico 23-34- 
pollicaribus, 1-capitatis. Folia sessilia, infra pollicaria, linearia, integra, trifida vel pinnatifida, 
pilosa. Capitula terminalia, subglobosa, 4-5 lineas diametro, multiflora; involucri bractez 
numerose, subszequales, 2-3-seriate, lineares, acute, pilose; receptaculum nudum, conicum ; 
corolle ligulatz 2-3-seriate, minime, angustissime, stylum non superantes ; corolle tubulose, 
4-5-mere. Achenia immatura pilosula, marginata; pappi palez 4-5-lacere, seta 0 vel interdum 
1 (1-3 ex Benth. et Hook. loc. cit.), caducissima. 
SoutH Mexico, Jalapa (Coulter, 406). Hb. Kew. 
48. PSILACTIS. 
Psilactis, A. Gr. Pl. Fendl. p. 71; Benth. et Hook. Gen. Plant. i. p. 269. 
Three slender herbaceous species. 
1. Psilactis asteroides, A. Gr. Pl. Fendl. p. 72. 
Texas, New Mexico.—Norru Mexico, llanos in the Sierra Madre, west of Chihuahua 
(Wislizenus). Hb. Kew. 
2. Psilactis brevilingulata, Schz. Bip. ; Hemsley, Diag. Pl. Nov. pars altera, 
p. 24. 
Herba annua, erecta, circiter sesquipedalis, puberula, superne parce ramosa, caule ramisque teretibus, 
striatis. Folia rigida, scabra, linearia, circiter pollicaria, sursum gradatim breviora, obtusa, 
interdum paucidentata. Capitula parva, solitaria, pedunculata ; involucri bractee anguste, 
3-seriate, extus glanduloso-puberule ; receptaculum planum, foveolatum. Flores radii brevis- 
simi, pappo ad annulum reducto ; disci tubulosi, pappo e setis circa 20 zqualibus. Achenia 
pubescentia. 
Nort Mexico, region of San Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 390) ; 
SoutH Mexico, near Tacubaya (Schaffner). Hb. Kew. 
8. Psilactis coulteri, A. Gr. Pl. Fendl. p. 72. 
Nortu Mexico, Sonora Alta (Coulter, 295). Hb. Kew. 
49. ACHAITOGERON. 
Achetogeron, A. Gr. Pl. Fendl. p. 72 et in Proc. Am. Acad. vill. p. 651; Benth. et Hook. Gen. Plant. 
ii. p. 1282. 
‘‘ Pappus simplex, coroniformis, e squamellis 4-6 basi plus minus coalitis, cat. Erigerontis. "—A. Gr. 
1. Achztogeron galeottii, Gray, MSS. 
Ultrapedalis e radice perenni, hirsutulus vel pubescens; foliis caulinis lanceolatis seu linearibus 
plerumque dentibus paucis angustissimis patentibus instructis ; involucri bracteis sublanceolatis _ 
fere tomentosis ; ligulis parum 100 linearibus (albis) ; “acheniis glabris, 2-4-nerviis, pappo bre- 
vissimo, 8—4-dentato (denticulis subulatis basi parum coalitis) instructis. 
Sour Mexico, in woods on the peak of Orizaba (Galeotti, 2166), Sierra San Pedro 
Nolasco (Jurgensen, 227). Hb. Kew. 
