474 PROCEEDINGS OF THE AMERICAN ACADEMY. 



ovatis longiuscule acuniinatis sed ad apicem verum obtusis basi plus 

 minusve angustatis valde inaequalibus et obliquis margine undu- 

 latis supra scabriusculis subglabris verucosis suljtus paullo pallidiori- 

 bus punctatis et breviter praesertim in veniis pilosulis ca. 8 cm. longis 

 ca. 4 cm. latis; petioHs ca. 1 cm. longis; corymbis in caule ramisque 

 terminalibus 4-8-capitulatis densis; capitulis 7 mm. diametro 70- 

 floris; involucri campanulati squamis ca. 23 subaequalibus lanceolati- 

 linearibus 2-costatis viridibus in linea media (inter costas) ciliatis 

 aliter subglabris extimis calloso-obtusis interioribus attenuatis; re- 

 ceptaculo conico nudo; coroUis albis glaberrimis eglandulosis, tubo 

 proprio gracili fauces cylindratas subaequanti; achaeniis nigrescenti- 

 bus saepius curvatis glaberrimis vel basin versus in angulis obscure 

 hispidulis; pappi corona ad mediam partem .5-lobata, lobis plerisque 

 deltoideo-ovatis muticis margine denticulatis. — A. tomentostim Klatt, 

 Bull. Soc. Bot. Belg. xxxi. 185 (1892), pro parte, non Hemsl. (a quo 

 longe distat). — Costa Rica: in arenosis secundum flumen Ceibo, 

 Pittier, n. 4914 (hb. Gray.). 



NoTA. — Haec planta minus cognita (an abnormalis) differt ab A. corymboso 

 caule ut videtur herbaceo, foliis basi obliquis, involucri squamis laevioribus 

 extimis calloso-obtusis, corollis glaberrimis, ab A. scabriusculo foliis multo 

 majoribus basi obliquis, corollis albis, characteribus involucri, ab A. tomentoso 

 toto coelo. 



22. A. CORYMBOSUM Zuccag., suffruticosum vel vero fruticosum 

 erectum vel saepe decumbens 3-7 dm. altum simplex vel ramosum plus 

 minusve griseo-pubescens vel -tomentosum ; foliis oppositis vel supre- 

 mis alternis flrmiusculis o^•atis vel rhomboideo-lanceolatis plerisque 

 acutis basi rotundatis \e\ cuneatis margine grosse crenatis A'el dentatis 

 rarius serratis a basi 3(-5)-nerviis saepe reticulatis 3-6 cm. longis 1- 

 3.5 cm. latis utrinque pallide viridibus supra saepius scabris puberulis 

 subtus molliter crispe puberulis vel plus minusve tomentosis; petiolis 

 4-8 mm. longis; corymbis in caule ramisque terminalibus saepe pluri- 

 bus simplicibus vel compositis multicapitulatis; pedicellis filiformibus 

 3-12 mm. longis glandulari-tomentellis; capitulis ca. 7 mm. diametro; 

 involucri campanulati vel hemisphaerici squamis lanceolato-linearibus 

 attenuatis hispidulis 2-costatis apicem versus saepe coloratis; recep- 

 taculo nudo; corollis extus parce glandulari-atomiferis et saepius plus 

 minusve pubescentibus limbum versus caeruleis et vulgo hispidulis, 

 tubo proprio gracili fauces paullo ampliatas subaequanti; achaeniis 

 2.2 mm. longis atrobrunneis vel nigrescentibus glabris; pappo crateri- 

 formi 0.3 mm. longo albido margine subintegro vel paullo irregulari- 

 terque dentato. — Zuccag. ex Pers. Syn. ii. 402 (1807). Sixtrgano- 



