ROBINSON.— ALOMIA, AGERATUM, AND OXYLOBUS. 451 
versus attenuatis apice annulo integerrimo cartilagineo coronatis.— 
Brasii1a: prov. Goyaz, Glaziou, n. 21,579 (hb. Berol., hb. Kew., 
fragm. in hb. Gray.). 
17. A. aceratorpEs HBK., herbacea perennis suberecta diffuse 
ramosa 3 dm. vel ultra alta; ramis oppositis teretiusculi-tetragonis 
rimo obscure hirtellis, tardius glabratis foliatis saepissime brunnes- 
centibus; foliis oppositis petiolatis ovatis acutis acute serratis vel 
subintegris 1.5-3.5 em. longis 1-1.4 em. latis trinerviis primo sparse 
hirtellis mox glabrescentibus subtus distincte pallidioribus; petiolis 
brevibus 2-4 mm. longis plus minusve pilosis ciliatisque; capitulis 
parvis ca. 6 mm. diametro ca. 25-floris laxe cymoso-paniculatis, 
ramulis paniculae s dialibus scorpioideis, pedicellis filiformibus 
rectiusculis vel leviter arcuatis 1-3 em. longis, bracteolis parvis 1-3 
subulati-linearibus instructis; involucri campanulati squamis ca. 30 
sub-biserialibus lanceolatis acutis saepissime 2-costatis; corollis pur- 
pureis 1.8 longis glabris vel glabriusculis, tubo proprio faucibus 
subcylindratis breviori; achaeniis glabris nitidis nigrescentibus acute 
5-angulatis saepe leviter curvatis 1.5 mm. longis.— Nov. Gen. et Spec. 
Iv. 152, t. 354 (1820); Hemsl. Biol. Cent.-Am. Bot. ii. 79 (1881); 
Hoffm. in Engl. & Prantl, Nat. Pflanzenf. iv. Ab. 5, 134, f. 78 A (1890). 
Ethulia ageratoides (HBK.) Spreng. Syst. iii. 458 (1826). Phalacraea 
Lindenii Sch. Bip. ex Benth. & Hook. f. Gen. ii. 240 (1873).— Mexico: 
Guerrero prope Mescala, Humboldt & Bonpland, n. 3949 (hb. Par., 
phot. in hb. Gray.); Puebla ad Matlala, Liebmann, n. 84 (hb. Havn., 
hb. Gray.); Hidalgo ad Cazadera, Liebmann, n. 82 (hb. Havn., fragm. 
in hb. Gray.), sine loco indicato, Liebmann, n. 83 (hb. Havn., fragm. 
in hb. Gray.). Duo ultima sunt forma dubia inflorescentiis densiori- 
bus et ut apud Ageratum littorale vel A. maritimum longe pedunculatis. 
18. A. ancustata (Gardn.) Benth., annua erecta pauciramea 4-6 
dm. alta; radice fibrosa; caule tereti striato cum pilis glanduloso- 
viscosis instructo; foliis plerisque alternis longe graciliterque petiolatis 
Ovato-deltoideis vel rhomboideis grosse inaequaliterque dentatis vel 
lobatis utrinque pilosis 3-nerviis 6-7.5 cm. longis basi subtruncatis, 
dentibus sinubusque obtusis, illis mucronulatis; petiolis et pedunculis 
viscoso-pilosis; capitulis 12—15-floris ad apices ramorum in corymbulis 
‘regulariter dichotomis dispositis; involucri squamis ca. 12 glandu- 
°so-pilosis herbaceis acuminatis 3-nerviis 5 mm. longis sub-biseriatis 
ciliatis; corollae tubo proprio glandulari-puberulo, faucibus modice 
ampliatis; achaeniis prismaticis nigris calvis.— Benth. ex Bak. in 
Mart. Fl. Bras. vi. pt. 2, 190 (1876). Piqueria angustata Gardn. in 
Hook. Lond. Jour. Bot. vi. 432 (1847).— Brasti1a: prov. Goyaz, in 
