890 APPENDIX D. — BOTANY. 



ligulati ; ligula oblonga, apice tridentata. Flores disci hermaphroditi 

 4-dentati. Styli rami lineares, appendice elongato-lanceolata ter- 

 minati. Achenia radii et disci conformia. Pappus uniaristatus ; 

 arista scabra corolla breviore ; squamulse, nullae, suffrutices e 

 basi ramosissimi. Folia opposita, vel alterna, ovata petiolata den- 

 tata vel sublobata. Pedunculi terminales, elongati, monocephali. 

 Flores lutei. 



M. STANSBURIANA, Torr. — Crevices of limestone rocks on Stans- 

 bury's Island, Salt Lake. Fl. June 26. 



The lower part of the stem is thick and ligneous, but the branches 

 are herbaceous. These are about a span high and are minutely 

 glandular-pubescent. The leaves are scarcely half an inch in dia- 

 meter, broadly ovate, or almost orbicular in outline, often subcor- 

 date at the base, with a few coarse, obtuse teeth, or almost lobed ; 

 the lower ones mostly opposite, but the upper ones often alternate. 

 Heads 6-8 lines in diameter. Scales of the involucre in two 

 or three series lanceolate, acute, glandularly puberulous, some- 

 what villous at the tip. Rays 6-10; the limb longer than the 

 tube, and nearly twice as long as the involucral scales. Disk 

 flowers constantly 4-toothed in all my specimens. Achenium obo- 

 vate-oblong, compressed, slightly hispid-ciliate on the margin, 

 crowned with a single rigid, upwardly scabrous bristle. 



This genus is nearly related to Perityle of Bentham (Bot. Sulph. 

 p. 23,) but differs in the absence of squamellae on the achenium; 

 the pappus consisting of a single bristle. A second species exists 

 in Lindheimer's Texan collection of 1850, (No. 314.) 



Plate yi. Monothrix stansburiana, of the natural size. Fig. 1, 

 a leaf. Fig. 2, A head of flowers. Fig. 3, an involucrum laid 

 open, the flowers removed to show the receptacle. Fig. 4, the 

 same divided longitudinally. Fig. 5, an inner and an outer scale 

 of the involucrum. Fig. 6, a ray flower. Fig. 7, a disk flower. 

 Fig. 8, corolla of the disk flower laid open. Fig. 9, branches of 

 the style and their appendages. 



Chenactis stevioides, Hook, and Arn. ; Torr. and Gray, Fl. 

 2, p. 371. — Strong's Knob, Salt Lake, June 10. Several of the 

 ray flowers have the corolla dilated, but the lobes still nearly equal, 

 and, as is the pappus, considerably shorter than in the disk flowers. 



0. tenuifolia of Nutt. is scarcely distinct from this species. 



C. ACHILLE^FOLIA, Hook. and Arn.; Torr. and Gray, Fl. 1. c. — 

 Stansbury's Island, June 20. Stems about a span high, several 



