160 The Botanical Gazette. [April, 
type is unknown. The original name of Moquin’s variety is 
not retained because of its previous adoption in this genus as 
a specific name. 
A further acquaintance with growing specimens of G. de- 
cumbens and G. nitida may lead to their consolidation, for it 
is difficult to distinguish them on the basis of general habit. 
Rothrock, however, says of G. nztida, ‘‘Certainly it is not G. 
decumbens Jacq., as in the latter only the interior sepals are 
silky, and the outer ones are obtuse, whereas in my speci- 
mens all are silky and acute.” 
+ + Heads and flowers large: bractlets broadly crested. 
5. G. GLOBOSA L. Sp. Pl. 224. 1753. 
Distinguished from the next by its broad leaves, slender 
fibrous roots, and uniformly globular heads with broadly 
winged blunt bractlets.—Native of India, introduced into 
tropical America. Type unknown. 
6. G. TUBERIFERA Torr. Bot. Mex. Bound. 181. 1859. 
Stems erect from a fusiform fleshy and farinaceous root: 
leaves lanceolate to linear: peduncle elongated, simple: heads 
globose or oblong-ovate: flowers shining, pale rose-color: 
calyx about equalling the narrowly keeled broadly crested 
bractlets: sepals very acute.—On the rocky banks of the San 
Pedro and other western tributaries of the Rio Grande. Types 
in herb. Gray, Columbia College and Nat. herb. 
*** Stiomas filiform on a long style: bractlets thin, keeled, 
ut without crest or lacinee. 
+ Stems very long, with conspicuously swollen joints: heads 
small, often aggregated. 
7. G. SONOR& Torr. Bot. Mex. Bound. 181. 1859. 
G. decipiens Wats. Proc. Am. Acad. 21: 437. 1886. 
Stem tall, jointed, trichotomously branched, from a straight 
ligneous tap-root: leaves rather narrow, acute, 3 to 6™ long, 
tapering into a winged petiole: both axillary and terminal 
heads mostly composed of two or three closely aggregated 
small heads, bractlets keeled, not crested, slightly longet 
than the sepals, easily deciduous, leaving the woolly flowers 
exposed.——Southern Arizona and Sonora. Types in herb. 
Gray, Columbia College and Nat. herb. (no. 1749 Wright, 
collected at Santa Cruz, Sonora). 
