ROBINSON. — NEW SPERM ATOPHYTES, CHIEFLY FROM MEXICO. 41 



streams, Tarascon, Mexico, 28 October, 1905, C. G. Pringle, no. 10,118 

 (type, in hb. Gray). According to note of Mr. Pringle this variety grows 

 to a height of 3-4.5 m. 

 V Verbesina pedunculosa Robinson, n. comb. ActinomeHs peduncu- 

 losa DC. Prod. v. 576 (1836). Verbesina Capitaneja Nees, Linnaea, 

 xix. 729 (1847) ; Rob. & Greenm. Proc. Am. Acad, xxxiv. 54© (1899). 



Verbesina pleistocephala Robinson, n. comb. Encelia pleistoa 

 phala J. D. Smith, Bot. Gaz. xiii. 189 (1888), & Enum. PI. Guat. i. 22 

 (1889). Verbesina Donnell-Smithii Coult. Bot. Gaz. xx. 50 (1895) ; 

 J. D. Smith, Enum. PL Guat. iv. 88 (1895) ; Rob. & Greenm. Proc. 

 Am. Acad, xxxiv. 556 (1899). 



Coreopsis Pringlei Robinson, n. sp., fruticosa ramosa ; ramis tereti- 

 bus a cortice ochraceo-griseo obtectis ; ramulis striatis viridibus plus 

 minusve 6-angulatis foliosis ; foliis oppositis petiolatis bipinnatifidis 

 pallide viridibus glaberrimis vel vix pilosiusculis 2-4 cm. longis 1-3 cm. 

 latis, segmentis paten tibus angustissime linearibus leviter acutatis in- 

 tegris vel cum lobis secundariis paucis similibus instructis 4-16 mm. 

 longis 0.6-0.8 mm. latis ; capitibus terminalibus solitariis vel ad 3-5 

 corymbosis pedunculatis erectis vel nutantibus 3 cm. latis (ligulis pa- 

 tentibus inclusis) ; pedunculis 1-4 cm. longis nudis vel in media parte 

 cum bractea unica lineari instructis ; involucri campanulati squamis 

 exterioribus ca. 8 herbaceis lineari -oblongis 3-5 mm. longis 1 mm. 

 latis apice rotundatis basi pilosiusculis, squamis interioribus ovato- 

 oblongis subscariosis acutatis ca. 6 mm. longis striatis flavido-brunneis ; 

 ligulis ca. 8 juventate supra aureis subtus flavidis maturitate laete 

 Mavis oblongis ca. 1.2 cm. longis 4-6 mm. latis, nervis atrobrunneis ; 

 paleis linearibus pallicLjs brunneo-lineolatis apice obtusis eroso-ciliatis ; 

 achaeniis disci linearibus valde obcompressis in facie interiore et in 

 marginibus valde villosis in facie exteriore subglabris 5 mm. longis 

 (vix maturis) ; pappi aristis 2 pallidis villoso-plumosis attenuatis 3-4 

 mm. longis. — Dry ledges, San Juan del Rio, Queretaro, Mexico, alt. 

 1920 m., 8 September, 1905, C. G. Pringle, no. 10,050 (type, in hb. 

 Gray). This species is related to C. rhyacophila Greenman, but differs 

 in its linear-oblong round-tipped outer involucral scales and much 

 narrower leaf- segments, as well as in its shorter petioles and more 

 decidedly ligneous stem. 



Tridax platyphyila Robinson, n. sp., herba, perennis laxe ramosa 

 pubescens ; caulibus teretibus viridibus vel purpurascentibus striatulis 

 pubescentibus ; foliis membranaceis oppositis petiolatis supra basin 3- 

 nerviis, lamina late ovata 6.3-11.5 cm. longa 4.5-10 cm. lata dentata vel 

 leviter 3-lobata supra viridi sparse pubescenti cum pilis basi tuberculo- 

 incrassatis subtus vix pallidiore in nervis appresso-pubescenti apice 



