1921] SCHNEIDER, NOTES ON AMERICAN WILLOWS, XII. 71 



minusve coetanea, brevissime pedunculata, parva, ellipsoidea, densiflora; 

 flores masculi diandri, filamentis glabris liberis, antheris flavis, glandulis 

 d u o b u s , ventrali ovoideo-rectangulari, dorsali minore filiformi saepe 

 minima, bracteis atrofuscis; feminei fructusque subsessiles, glabri; styli 

 breves vix ad 1 mm. longi, stigmatibus minimis bifidis; glandula 1, ven- 

 tralis, ut in masculis; fructus e basi ovoideo-rhomboidali conico-subros- 

 trati 4-5.5 mm. longi. 



As I have already explained in this Jour. i. 229, S. Wolfii represents a 

 rather peculiar type among American Willows, especially on account 

 of the presence of a dorsal gland in the male flowers. I, therefore, thought 

 it best to propose a new section for it. 



50. S. Wolfii Bebb. — See Schneider, 1. c. in this Jour. I. 329. 



50b. S. Wolfii var. idahoensis Ball. — See Schneider in this Jour. i. 231. 



Sect. XI. Mexicanae Schneider, sect, now — Frutices ut videtur 

 mediocres, erecti, ramulis satis elongatis strictis divaricatis. Folia matuni 

 firma, satis crasse chartacea, elongato-laiiceolata ad anguste-elliptico- 

 lanceolata, glanduloso-denticulata, pubescentia vel glabra. Petioli breves, 

 2-8 mm. longi. Amenta autumno in axillis foliorum adultorum apparen- 

 tia, sessilia, breviter cylindrica, densiflora. Bracteae brunnescentes. 

 Flores masculi diandri, filamentis glabris liberis, antheris flavis, glandulis 

 d u o b u s ventrali-ovoideo-rectangulari, dorsali simili minore; feminei 

 ovoideo-conici, glabri, pedicello distincto glabro dimidio ovarii sublongiore 

 suffulti; styli distincti, sed breves stigmatibus oblongis bifidis subaequi- 

 longi; glandula 1, ventralis ut in masculis; fructus ovoideo-oblongi, sub- 

 rostrati, circ. 4 mm. longi pedicello 1.5-2 mm. longo excluso. — The two 

 species of this new section may have their closest affinity with those of 

 Sect. Cordatae but they possess a dorsal gland in the male flowers and 

 represent a rather well marked group among the American Willows. 

 As I have already pointed out in Bot. Gaz. lxv. 29 (1918) the late time 

 of flowering cannot be regarded as a valuable taxonomic character because 

 there are spring flowering forms of S. mexicana, and of S. lasiolepis there 

 are known forms of southern California flowering in the fall. 



51. S. Hartwegii Bent ham. — S. humilis * S. Hartwegii Andersson.— 

 S. humilis 3 ? Hartwegii Andersson. — See Schneider in Bot. Gaz. lxv. 28. 



52. S. mexicana Von Seemen. — See Schneider in Bot. Gaz. lxv. 29. — 



In the Herbarium of the Botanical Museum at Berlin-Dahlem I have 

 seen all the specimens mentioned by Von Seemen. The type was collected 

 by Berlandier at Zacualtipan, State of Hidalgo, and is No. 307. It con- 

 sists of a sterile shoot only. The specimen is marked by Andersson "Sal. 

 amygdaloides vel Sal. daphnoides?." The male syntype is a specimen 

 collected by C. Ehrenberg (No. 267) at "S. Pietro & S. Paolo," the fruit- 

 ing syntype is Uhde's No. 329, "Mexico 1846" without an exact locality. 

 53. S. Schaffnerii Schneider in Bot. Gaz. lxv. 30 (1918).-- -The male 

 plant being unknown, the systematic position of this species remains 

 doubtful. 



