surface, along with the hypanthium sericeous in its interior are unmistakeable. Furthermore, the 
characteristic fungal dark spots on the leaf undersurfaces can also be seen. No other species in 
the region has these spots, apparently a case of unispecific parasitism, and although not properly 
a feature of the plant itself, they can be used as a character for identification. Variation in C. 
salicifolium is found mainly on flower pubescence. Type material has tepals glabrous outside and 
hypanthium sericeous inside, but in the material now at hand there are specimens with inner 
tepals or the whole perianth more or less pubescent outside and hypanthia less pubescent inside 
in different degree, yet all of them have appressed sericeous pubescence on lower leaf surface 
and dark spots too. 
Specimens examined. MEXICO. Hidalgo. Huasca, near Regla, Ehrenberg 875 (F, A); 
Jacala, V. H. Chase 7311 (MO, F); Zimapan, Los Nogales, 30 km al NE de Zimapan, R. 
Hernandez & I. Hernandez 6541 (MO); Zimapan, La Majada, 20-25 km al NE de Zimapan, R. 
Hernandez & I. Hernandez 6533 (ENCB, MO); Zimapan, Maguey Verde, 25km al NE de 
Zimapan, R. Herndndez 3736 (MO). Querétaro. Landa, 2km al SE de El Rincon, H. Rubio 1854 
(IEB); Landa, 1.5km al NE de El Rincon, H. Rubio 2320 (LEB); Landa, Puerto del Soyatal, 
aprox. 5 km al N de Acatitlan de Zaragoza, E. Gonzalez 731 (IEB); Jalpan, 5-6km al S de La 
Parada, B. Servin 300 (IEB); Landa, 2km al NE de El Sabinito, H. Rubio 161] (IEB); Landa, 1.5 
km al SE de La Yesca, H. Rubio 995 (IEB); Landa, El Bordo, 2km al SE de El Sabinito, H. 
Rubio 621 (IEB); Pinal de Amoles, Al W de La Cuesta de Huazmazontla, E. Carranza 2157 
(IEB); Landa, 2km al NE de El Rincon de San José, H. Rubio 1643 (IEB); Landa, 2km al SE de 
El Rincon de San José, H. Rubio 1930 (IEB); Landa, El Sdtano Colorado, 1km al NW de La 
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