V. 



PLANT^ WRIGHTIA^M;. 



89 



261. T. Wrightii, Gray, Pl. Fendl p. 65. Low or wet places, ncar Austin 

 and San Marcos, Texas ; July. — There is a third species in Gregg's last Mcxican 

 collection.* 



262. Machj^ranthera (Dieteria) canescens, var. glabra: foliis lanceolatis 

 viridibus cauleque scabridis fere glabris ; ramulis puberulis ; capitulis laxc corym- 

 bosis ; involucri campanulato-turbinati squamis pluriserialibus apicibus viridibus 

 parvis vix squarrosis. — Sand-bars of the Rio Grande below El Paso, and at Pre- 

 sidio de San Elisario, New Mexico ; Sept. — This is better marked in its charac- 

 ters than some of the species described by Nuttall and adopted in the Flora of 

 North America ; but I am confident that Dicteria canescens, pulvcrulcnta, incana, 

 divaricata, viscosa, and sessiliflora, Nutt.., Torr. 8c Graj/, Fl. 2. p. 100, are all forms 

 of one widely spread and very polymorphous species, which varics according to sit- 

 uation, &c. D. asteroides, Torr. in Emori/^ Fep. p. 142 (which has Janceolate 

 leaves), accords with one of Wrighfs spccimcns, except that the involucral scales 

 are looser and with ratlier longer tips. 



Trichocoronis Geeggii (sp. nov.) : pusilla ; caule procumbente vel fluitante ; foliis oblongis intcgcr- 

 Timis subamplexicaulibus ; pedunculo solitario monocephalo ; tubo corollse faucc campanulata ccquilongo ; 

 involucri squamis linearibus ; pappo plurisquamellato-subcoroniformi et 2 - S-aristellato. — Bctwcen IVIex- 

 ico and Mazatlan, Gregg. — Leaves thickish, 2-3 lines long. Peduncle simple, one or two inchcs long. 

 Head twice as large as that of T. Wrightii ; the involucre, &c. similar, 



Stevia trichopoda, Pl Fendl p. 64, is the same as S, podoccphala, DC. The pappus of some of the 



exterior flowers is occasionally awnless. 



The genus Carphochcete is confirraed by tvvo additional species. The character must be somewhat ex- 



tended as to the pappus : 



CARrilOCIIyETE, Gray, Pl Fendl p. 65. 



Capitulum 4-6-florum, homogamum. Involucrum cylindricum ; squamis lanceolatis substriatis imbri- 

 catis, exterioribus brevioribus. Ecceptaculum nudum. Corollaj tubulosse, hypocraterimorphaj, involucrum 

 superantes, lobis lanceolatis glabris. Styli rami fiiiformes. Achenia gracilia 10-striata, costis altcrnis for- 

 tioribus subpentagona. Pappus paleaceus ; paleis 5-14 elongatis lineari-Ianceolatis denticulatis uniner- 

 viis, nervo crasso in aristam barbellato-scabram coroUa subsequilongam sensim exserente, atque paucis 



(1-5) parvis exterioribus muticis. 



Herbse basi suffruticosa, vel suff^rutices, Mexicana) ; foliis oppositis 



laxe 



bus roseis vel albidis circiter unciam longis. 



WlSLIZENI 



elongatis ; squamis involucri vix ciliatis impunctatis subulato-acuminatis ; pappo e paleis 5 aristatis et 5 ex- 



terioribus parvis ovalibus cuneatisve enerviis. 



Mountains near Cosiquiriachi, Northern Mexico, Wisli- 



zenus. 



Leaves two inches or more in length, scarcely a linc widc. 



2. C. Grahami (sp. nov.): caulibus gracilibus pedalibus ot ultra puberulis ; foliis linearibus seu lineari- 

 oblongis obtusissimis, superiorlbus parvis dissitis ; squamis involucri arachnoidcs-ciliatis mucronatis impunc- 



tatis; pappopaIeis7-9aristatis cum 1-3 exterioribus parvis oblongis enervns 



Mexico, Graham (in 



herb, Benth.), Seemann. 



Cauline leaves an inch or an inch and a half long, two or three lines wide, the 



uppermost much smaller, conspicuously dotted. Heads corymbose. Branches of the style veryMong. 



3. C. BiGELOVii (sp. nov.): puberula, fruticosa ; foliis oblongis confertis ; squam.s mvolucri subacu- 

 minatis resinoso-punctatis ; paleis pappi 12 - 14 aristatis cum 1 - 3 parvis lanceolatis muticis unmervus 



Dr. Torrey. — The leaves barely half an inch long. 

 half an inch long. Corolla two thirds of an incli long. 



.. H. Bigelow. Communicated in a letter to 

 Heads hmeT than in the two preceding. Achenia 



