390 APPENDIX D. BOTANY. 



Crevices of limestone rocks on Stansbury's Island, Salt Lake. Fl. 

 June 20.* 



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. Eays 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 squamellre on the achenium, 

 and in other characters. 



Plate VI. Laphamia Stansburii, (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 recep- 

 tacle. 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 Am.; 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. 



C. Tenuifolia of Nutt. is scarcely distinct from this species. 



C. achilleuEfolia, Hook, and Arn. ; Torr. and Gray, Fl. I.e. — 

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



* The Laphamia of Dr. Gray, although published subsequently to Monothrix, 

 must take precedence of that genus, as it. now embraces one species with a 

 pappus of many bristles, another with a bisetose pappus, and two other species 

 that are quite destitute of a pappus ; so that the latter name is no longer ap- 

 propriate. 



