ROBINSON. — SYNOPSIS OF THE GENUS MELAMPODIUM. 465 



■*- -t- t- t- Leaves rhombic to oblong, narrowed to a sessile auriculate base. 

 ++ Leaves oblong, relatively narrow. 

 = Outer involucral bracts 2, not accrescent, or scarcely so. 



33. M. bibracteatum, Watson, Proc. Am. Acad. xxvi. 140 (1891). 

 Fields, Del Rio, State of Mexico, Pringle, no. 3230. 



= = Outer bracts 4 to 5, obtuse, united at the base into a cup. 



34. M. glabrum, Watson. Proc. Am. Acad. xxvi. 139 (1891). — 



Guanajuato in valley near Irapuato, Pringle, no. 2821, and Jalisco near 



La Barca, Pringle, no. 3863. 



++ ++ Leaves broad, mostly obovate or rhombic : outer involucral bracts 5, con- 

 spicuously accrescent. 



= Outer bracts of the involucre lance-oblong, acute, distinct nearly or quite to 



the base. 



35. M. longifolium, Cerv. ace. to Cav. Anal. Cien. Nat. vi. 303 



(1803). M. rhomboideum, DC. Prodr. v. 520 (1836). — San Luis 



Potosi, Parry & Palmer, no. 444 ; Valley of Mexico, Bourgeau, no. 



868, Pringle, no. 6455, Harshberger, no. 176. 



= = Outer bracts of the involucre ovate, obtuse or obtusish, connate toward 



the base. 



36. M. perfoliatum, HBK. Nov. Gen. & Spec. iv. 274 (1820).— 

 A common and well-marked weed throughout Mexico, also established 

 in S" California at Los Angeles, Parish Brothers. 



Synonyms and Doubtful or Excluded Species. 



M. achillaeoides, Hemsl. Biol. Cent.-Am. Bot. ii. 145 (1881) =Vil- 

 lanova achillaeoides, Less. 



M. australe, Loefl. It. Hisp. 268 (1758) = Acanthospermmn brasihnn, 

 Schrank, ace. to Hook. f. & Jacks. Ind. Kew. ii. 188. 



M. Baranguillae, Spreng. Syst. iii. 619 (1826) \_M. Baranquillae, DC. 

 Prodr. v. 521 J = Sclerocarpus africanns, Jacq., ace. to DC. Prodr. v. 

 521. 



M.Berlerianum, Spreng. 1. c. An unrecognized and poorly described 

 West Indian plant, very likely not of this genus. 



M. Lrachyglossum, J. D. Smith, Bot. Gaz. xiii. 74 (1888) =Jaegeria 

 hirta, Less. 



31. copiosum, Klatt in Engl. Jahrb. viii. 41 (1887) = M. paludosui/i, 

 HBK. 



M. coronopifolium, Sch. Bip. in Hemsl. 1. c. = M. hispid/an, HBK. 



M. digynum, Benth. & Hook. f. Gen. ii. 349 (1873), ace. to Hook. f. 

 & Jacks. 1. c. = M. camphoratum, Benth. & Hook. f. 



M. divaricatum, DC. 1. c. = M. paludosum, HBK. 



VOL. XXXVI. — 30 



