118 PLANTiE WRIGHTIAN^. V. 



diameter ; in ours, the involucre is campanulate and twice as broad ; but I notice 

 no further difference. 



365. H. TENUiFOLiuM {Cttss. I. c.) : caulibus herbaceis gracilibus duriusculis laxe 

 ramosis ; pedunculis elongatis nudis ; foliis pinnatipartitis scabro-puberulis, lobis 

 subulatis brevibus junioribus setigero-mucronatis ; involucro turbinate basi breviter 

 parceque bracteato ; pappo coroUam disci sequante e paleis 10 conformibus oblongis 

 seu lineari-oblongis setoso-triaristatis, aristulis lateralibus brevioribus, vel uniarista- 

 tis cum lobis lateralibus 2 (nunc 3-4) setaceis. — H. tenuilobum, DC. Prodr. 5. 

 p. 642. Hills and bluffs of the San Felipe, and on the E-io Grande, Texas ; July. 

 — I have cultivated this from seeds sent b)' Mr. Wright from the Rio Grande ; and 

 it proved to be a diffusely branched perennial, or at least to continue two or three 

 years, although the root in indigenous specimens seems to be that of an annual. 

 Besides the pappus, which so well distinguishes it, the stems are more slender and 

 elongated than in any of the foregoing, sometimes a foot long, the branches termi- 

 nated by nearly naked peduncles of three or four inches in length ; and the lobes of 

 the leaves (cinereous-puberulent in the wild plant) are short and subulate, only one 

 or two lines in length. Involucre three lines long, smooth, subtended by three or 

 four small and subulate appressed bracts. Rays oblong. Paleee of the pappus all 

 alike, except that a few are rather smaller, cleft into one or sometimes two capillary 

 awns and two short lateral setae or setaceous teeth, and occasionally showing a pair 

 of minute additional teeth. Sometimes the principal lateral lobes are merely seta- 

 ceous or subulate teeth ; often one or both of them are as slender as the proper 

 awn, and of half or two thirds of its length. — I was enabled to inspect the original 

 of Cassini's Hymenatherum tenuifolium in the Jussieean herbarium, where it is 

 marked "Chili 1 Nee ; donne par M. Thibaud in 1809." I have little doubt that 

 it came from Northern Mexico, instead of Chili, and that it is identical Avith the 

 species here described. At least its pappus accords very well with this species, and 

 with no other known to me. 



366. H. Gnaphalopsis, Grai/, PI Fendl. p. 90 ^ 115. Gnaphalopsis micropoi- 

 des, DC! Prodr. 1. p. 258. Calcareous hills of the San Felipe, and of the Eio 

 Grande, Texas ; July. — This singular plant, with the aspect of a Micropus or 

 Gnaphalium, has all the characters of a genuine Hymenatherum. The thick AvooUy 

 covering conceals the sparse Tagetineous glands of the leaves and involucre. The 

 specimens received by De Candolle from Berlandier were very imperfect. 



360, partim. Lowellia aurea, Gray, PL Fendl. p. 91. Prairies at the Pass of 

 the Limpia ; Aug. — This plant has so exactly the aspect and floral structure of 

 Hymenatherum polychsetum (except as to the pappus, which was not noticed), that 

 the specimens were mingled in the distribution. The specimens are rather smaller 

 than Fendler's, and the truncate palese of the pappus are nine or ten in number, 

 two of them, however, being occasionally more or less united. The pappus ought 

 sufficiently to distinguish it from Hymenatherum, although there is some approach 

 to it in the latter genus. But, on the other hand, the discovery of rays and pinnate 

 leaves in Thymophylla, and the confirmation of Lagasca's character as to the pappus 

 of T. setifolia, invalidates the characters of Lowellia. 



