40 ROBINSON. 



i. Perennial herbs; leaves 2-4.5 (-5) cm. wide; heads 

 crowded I. 

 I. Heads about 7-flowered, sessile in dense subglobose 



glomerules; involucre subcylindric 22. E. (enuifoUum. 



I. Heads 20-25-flowered ; pedicels 1-9 mm. long; in- 

 volucre turbinate-campanulate . .23. E. pycnocephalum. 



i. Delicate annual; leaves thin, 2-5.5 cm. wide; inflorescence 



diffuse 23. E. microstemon. 



Brickellia ? Arsenei, spec, nov., herbacea perenne virgata 7 dm. 

 vel ultra alta; caule tereti gracili usque ad 3 mm. crasso folioso paullo 

 flexuoso atropurpureo erispe griseo-puberulo ; internodiis 1.5-4 em. 

 longis; foliis suboppositis vel saepe ternatim verticillatis sessilibus 

 lanceolatis argute acuminatis basi rotundatis serrulatis chartaceis 3-4.5 

 cm. longis 1-1.6 cm. latis penniveniis supra reticulatis et minute granu- 

 latis subtus paullo pallidioribus reticulatis et in costa media et in venis 

 majoribus puberulis; inflorescentia terminali multicapitata cor;yTnbosa 

 convexa; capitulis graciliter pedicellatis ca. 12-floris ca. 1 cm. longis; 

 involucri scjuamis ca. 20, 3-4-seriatim imbricatis regulariter gradatis, 

 extimis brcAnssimis puberulis ceteris lanceolato-oblongis obtusiusculis 

 glabris 3-nerviis in parte exposita atro-vinaceis ; flosculis valde immaturis; 

 coroliae dentibus anguste oblongis; antheris angustis ad apicem 

 longiuscule appendiculatis ; pappi setis albidis vix scabridis. — Mexico : 

 \dcinity of Morelia, State of Michoacan, 26 Oct., 1911, alt. 2500 m., 

 Bro. G. Arsenc, no. 5608 (Gr., U. S.), distributed as FAipatoriwn pulchel- 

 Iwn HBK. It is unfortunate that this beautifully distinct plant, 

 obviously of the Evpatorium tribe, is available only in bud, so that it is 

 impossible to determine the form of the mature achenes. However, 

 as it is unlikely that the locality will be visited by a botanist for some 

 time to come, and as the habit and such details of floral structure as 

 are shown pretty clearly indicate that this is a new species of Brickellia 

 § Stcviastnim, the writer ventures to give it provisional record on this 

 theory. It is a pleasure to dedicate it to Bro. Arsene, whose careful 

 collections are among the most extended and valuable which have come 

 from Mexico in recent years. 



Galea caracasana (HBK.) Ktze., var. pilosior Ktze. Rev. Gen. i. 

 324 (1891). Of this more hairy variety of this common and in northern 

 South America somewhat widely distributed and variable species, 

 there is, besides the more common radiate state, a discoid form which 

 may be recorded as follows: 



Forma discoidea, forma nova, pubescens ut apud var. pilosiorcm, 

 capitulis homogamis, radiis nullis. — Colombia: forest, alt. 1200- 

 1500 m., "La Virginia," Libano, Dept. Tolima, 22 Dec, 1917, 

 Pennell, no. 3264 (N. Y.). Florets greenish-yellow. 



