484 PROCEEDINGS OF THE AMERICAN ACADEMY. 



type of the species. Further collection inuy show the two forms sufH- 

 ciently marked to make it worth while to distinfjuish them by name, 

 in which event it would he the hlue-flowered one which would have to 

 he given a new desiijnation tlius reversing the treatnuMit of Schultz, the 

 original author, whose manuscript names, though critical have no 

 nomenclatorial status since unaccompanied by published descriptions. 

 However, the distinction seems to be here scarcely of taxonomic 

 moment. The bluish color appears to be in this genus paler and in 

 drying much less permanent than in Apcratiim or Aloiiiia so that in 

 any but very fresh or recent and carefully dried material a sharp dis- 

 tinction would scarcely be possible. 



The technical distinctions of Oxylobus are chiefly in the form of the 

 corolla, Avhich has a relati^■ely slenderer proper tube than is usual in 

 Ageratum and a more ainple and abruptly expanded throat. The 

 lobes of the limb are not so uniformly acute as the generic name would 

 suggest, yet they are longer and more Avidely spreading than in the 

 nearly related genera. The pappus is uniformly short and its scales 

 are so deeply and irregularly cleft that their number, tliough not large, 

 becomes indefinite. 



OXYLOBIS ]\Ioc. (Xomen ab b^h, acuius, et Xo^Ss, lohiis, dentes- 

 corollae limbi alludens.) Capitula homogama parva ^■el mediocria. 

 In\'olucrum subcylindrati- vel infimdibuliformi-campanulatum, squa- 

 mis ovato- vel lanceolato-oblongis acutis dorso glandulari-tomentellis 

 subherbaceis, costis pluribus obscuris vel nullis. Receptaculura 

 planiusculum nudum. Corollae tubus proprius gracilis, faucibus 

 campanulato-cylindratis abrupte anapliatis, limbi tlentibus oblongis 

 vel anguste ovatis plerisque acutiusculis patentibus. Antherae apice 

 cum appendice membranacea ovata munitae basi rotundatae. Achae- 

 nia graciliter prismatica 5-angularia deorsum leviter decrescentia in 

 angulis sursum scabrata basi callosa. Pappus e squamulis 5-10 inae- 

 qualibus plerisque acutis et fimbriatis compositus achaenio multo 

 brevior.— Moc. ex DC. Prod. v. 115 (1836); Gray, Proc. Am. Acad. 

 XV. 25 (1879); Klatt, Leopoldina, xx. 75 (1884); Robinson & Green- 

 man, Proc. Am. Acad. xli. 272 (1905). Phania Sect. O.riilobus (Moc.) 

 DC. Prod. V. 115 (1836); Endl. Gen. 367 (1838). Ad Ageratum 

 allocatus, Benth. & Hook. f. Gen. ii. 242 (1873); Hemsl. Biol. Cent.- 

 Am. Bot. ii. 80 (1881); Hoffm. in Engl. & Prantl, Nat. Pflanzenf. iv. 

 Ab. 5, 137 (1890). In CarcUam injectus, Ktze. Rev. Gen. i. 325 (1891). 

 — SuflFrutices decumbentes ramosi vel simplices. Folia opposita 

 subcoriacea sempervirentia obtusa crenulata tenuiter reticulato- 



