G24 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Guadalupe y Calvo, alt. 2150 to 2300 m., Nelson, no. 4853; near 

 Colonia Garcia, 25 August, 1899, Nelson, no. 6097 ; near Casas Gran- 

 das, 15 August, 1899, Townsend & Barber, no. 438. This species has 

 been variously referred to C. scabiosoides HBK. and C. diversifolius 

 Otto. From the former it is readily distinguished by its larger and 

 much paler rays, yellow disk-flowers, and puberulent stem ; from the 

 latteV in having the stem puberulent instead of sparingly to copiously 

 beset with longer hairs, also in having a firmer leaf-texture, a more 

 leafy stem, etc. 



Cosmos scabiosoides HBK. Nov. Gen. et Spec. iv. 242 (1820). 

 This species presents leaf-forms so diverse that without the numer- 

 ous transitions now known it would be difficult to believe them con- 

 specific. The extremes are certainly so marked as to merit at least 

 formal recognition. The typical form, described as having " folia pin- 

 natipartita, foliolis aut laciniis quinque, sessilibus, lanceolato-oblongis, 

 acutis, basi cuneatis, apicem versus subserratis," was collected near 

 Patzcuaro in Michoacan, and appears to be exactly represented by 

 Pringle's no. 4263 from that locality. Differing markedly from this 

 typical form are the following: 



Forma indivisus, n. f., foliis indivisis integriusculis vel irregulariter 

 serratis lanceolatis vel lanceolato-ovatis. — Hills of Patzcuaro, Michoa- 

 can, 11 October, Pringle, nos. 4263 in part, and 3589 in part; in shady 

 places near San Miguelito, San Luis Potosi, Schaftner, no. 200 ; on the 

 Sierra Madre, Zacatecas, 18 August, 1897, Rose; near Santa Teresa, 

 Tepic, Rose, no. 3433 ; in the Sierra Madre, west of Balanos, Jalisco, 

 Rose, no. 2957. Transitions to the typical form are frequent and are 

 well illustrated by Purpus's no. 1551 (Salto de Agua, Mexico) in which 

 the lower leaves are undivided and the upper pinnatifid with lanceolate 

 segments. 



Calea Peckii, n. sp., fruticosa scandens ; caule volubile tereti lig- 

 noso lenticellis minutis prominulis scabro atrobrunneo oppositirameo ; 

 foliis oppositis ovatis subintegris breviter petiolatis acutis 2-4 cm. 

 longis 1-2.2 cm. latis basi subrotundatis 3-nerviis utrinque scabriuscu- 

 lis quamquam aspectu glabris subtus paulo pallidioribus aureo-atomi- 

 feris, petiolo gracili puberulo ca. 3 mm. longo ; pedicellis in axillis 

 superioribus binis vel trinis ; inflorescentia fasciculiformi vel corym- 

 biformi rotundata multicapitulata ; capitulis ca. 8 mm. diametro 

 homogamis ; involucri subcylindrici squamis valde inaequalibus exteri- 

 oribus brevibus late ovatis puberulis ciliolatisque subherbaceis plus 

 minusve squarrosis, intermediis longioribus ovato-oblongis flavescenti- 

 bus rubro-striatis, intimis anguste-lanceolatis laete flavis rubro-striatis 

 acutis; corollis flavis aureisve involucrum modice superantibus ; 



