484 PROCEEDINGS OF THE AMERICAN ACADEMY. 
type of the species. Further collection may show the two forms suffi- 
ciently marked to make it worth while to distinguish them by name, 
in which event it would be the blue-flowered one which would have to 
be given a new designation thus reversing the treatment 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 Ageratum or Alomia 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, which has a relatively slenderer proper tube than is usual in 
Ageratum and a more ample and abruptly expanded throat. The 
lobes of the limb are not so uniformly acute as the generic name WO d 
suggest, yet they are longer and more widely spreading than in the 
nearly related genera. The pappus is uniformly short and its scales 
are so deeply and irregularly cleft that their number, though not large, 
becomes indefinite. 
OXYLOBUS Moc. (Nomen ab 6é¢s, acutus, et oBds, lobus, dentes. 
corollae limbi alludens.) Capitula homogama parva vel mediocria. 
Involucrum subcylindrati- vel infundibuliformi-campanulatum, squa~ 
mis ovato- vel lanceolato-oblongis acutis dorso glandulari-tomentellis 
subherbaceis, costis pluribus obscuris vel nullis. Receptaculum 
planiusculum nudum. Corollae tubus proprius gracilis, faucibus 
campanulato-cylindratis abrupte ampliatis, limbi dentibus 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 17 
angulis sursum scabrata basi callosa. Pappus e squamulis 5-10 mae- 
qualibus plerisque acutis et fimbriatis compositus achaenio multo 
brevior.— Moe. 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. Oxylobus (Moe.) 
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. 1v- 
Ab. 5, 137 (1890). In Careliam injectus, Ktze. Rev. Gen. j. 325 (1891)- 
— Suffrutices decumbentes ramosi vel simplices. Folia opposita 
subcoriacea sempervirentia obtusa crenulata tenuiter reticulato- 
