460 PROCEEDINGS OP THE AMERICAN ACADEMY. 



lower leaves entire, lance-linear, acute at both ends, 4 to 5.5 cm. lono-, 

 4 to 5 mm. broad, the middle cauline leaves deeply and pinnately 3-cleft 

 into linear acute segments, finely pubescent above, flocculent-sericeous 

 beneath : peduncles filiform, springing from the forks, 2 to 5 cm. lonw : 

 heads 1.2 to 1.4 cm. broad (including the rather numerous well-exserted 

 narrow bright yellow ligules) : fruit tuberculate, the hood well developed 

 and passing gradually and without intermediate toothing into a lone 

 slender spirally coiled appendage. — Jalisco, Mexico, on dry hillsides 

 near Tequila, Dr. Edward Palmer, no. 391 (coll. of 1886), O. G. 

 Pringle, no. 4598. Type in herb. Gray. This plant although in habit 

 identical with M. hetcrnphyllum^ Lag., is strictly herbaceous and annual. 

 This fact, together with the hooded and appendaged fruit, seems to war- 

 rant its separation. It is certainly distinct from M. sericeum, Lag. 



•)-+++•»-+ Leaves undivided. 



13. M. KuNTHiANUM, DC.Prodr. V. 519 (1836). 31. serlceum,B.BK. 

 Nov. Gen. & Spec. iv. 272, t. 398 (1820), not Lag. — Of this species I 

 have seen only a single and imperfect specimen in the De Candollean 

 Herbarium. The leaves are linear, or nearly so, and entire ; the fruit is 

 provided with a well -developed hood but no appendage. This species 

 also exhibits a suspicious resemblance to 31. heterophyllum, Lag., and it 

 may represent Lagasca's var. ft. 



14. M. DiFFUSUM, Cass. Diet. lix. 238 (1829). 31. manillense, Less. 

 Linnaea, vi. 155 (1831). After examining authentic material of this 

 species in the Prodromus herbarium I can confidently refer to it Dr. 

 Palmer's nos. 3 and 281 from Acapulco, Mexico (coll. of 1895). The 

 species has been hitherto recorded only from the Island of Luzon. As 

 the genus as a whole is American, and as this species is now found to be 

 also an American plant, its occurrence in the Philippines may very likely 

 be due to introduction. At all events it seems from the distribution 

 of the other species more likely that this plant has been carried from 

 Mexico to the Philippines, than the reverse. 



Var. lanceolatmn. 3L lanceolatum, DC. Prodr. v. 519 (1836). — 

 Fruit with a short hood but no appendage ; otherwise closely like the 

 typical form. — Collected by Nee, but the locality unknown. Nee visited 

 both Acapulco, Mexico, and the Philippine Islands. 



§ 2. Zarabellia, DC. Fructiferous bracts not exceeding the in- 

 closed achenes, nor developed into a cup, hood, or appendage at the 

 summit. — Prodr. v. 519 (1836). Zai-abellla, Cass. Diet. lix. 240. 

 * Peduncles long and slender : ligules well exserted, conspicuous, 

 ■t- Leaves sericeous beneath. 



