ROBINSON. — ALOMIA, AGERATUM, AND OXYLOBUS. 451 



versus attenuatis apice anniilo integerrimo cartilagineo coronatis. — 

 Brasilia: prov. Goyaz, Glaziou, n. 21,579 (lib. Berol., hb. Kew., 

 fragm. in hb. Gray.). 



17. A. AGERATOiDES HBK., herbacea perennis suberecta diffuse 

 ramosa 3 dm. vel ultra alta; ramis oppositis teretiusculi-tetragonis 

 primo obscure hirtellis, tardius glabratis foliatis saepissime brunnes- 

 centibus; foliis oppositis petiolatis ovatis acutis acute serratis vel 

 subintegris 1.5-3.5 cm. longis 1-1.4 cm. 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 sympodialibus scorpioideis, pedicellis filiformibus 

 rectiusculis vel leviter arcuatis 1-3 cm. 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. etSpec. 

 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). Phalacraca 

 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, Lichmann., n. 84 (hb. Havn., 

 hb. Gray.); Hidalgo ad Cazadera, Lichmmm, n. 82 (hb. Havn., fragm. 

 in hb. Gray.), sine loco indicato, Liehmann, n. 83 (hb. Havn., fragm. 

 in hb. Gray.). Duo ultima sunt forma dubia inflorescentiis densiori- 

 bus et ut apud Agerahan littoralc vel A. rnaritimum longe pedunculatis. 



18. A. ANGUSTATA (Gardii.) 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 sul)truncatis, 

 dentibus sinubusque obtusis, iUis mucronulatis; petiolis et pedunculis 

 viscoso-pilosis ; capitulis 12-15-floris ad apices ramorum in corymbulis 

 irregulariter dichotomis dispositis; involucri squamis ca. 12 glandu- 

 loso-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). — Brasilia: prov. Goyaz, in 



