82 JOURNAL OF THE ARNOLD ARBORETUM [vol. hi 



S. cordata X S. pedicellaris. First observed by Forbes. See Toepffer, 

 Salieet. exsicc. fasc. vm. No. 372 (1913), and Knowlton and Deane in 

 Rhodora, xvi. 108 (1914). 



S. cordata X S. petiolaris. This cross has been found in several places, 

 first by Bebb, later by Dudley and also by Forbes. See Dudley in Bull. 

 Cornell Univ. n. 90 (1882). 



S. cordata x S. petiolaris X S. sericea. See under S. petiolaris x scricea. 



S. cordata x S. sericea. The oldest name for this hybrid seems to be 

 S. myricoides Muhlenberg in Neue Schr. Ges. Naturf. Fr. Berlin, iv. 

 235, pi. vi. fig. 2 (1803). See also Bebb, Herb. Salic. Am. No. 12-17 

 (1879); apud Gray, Man. ed. 6.484 (1890), and Schneider, in. Handb. 

 Laubh. i. 52 (1904), excl. synon. See also S. Bebbii. 



S. cordata x S. sub sericea. See S. petiolaris X sericea. 



S. cordifolia X S. planijolia. Such a hybrid may be represented by A. 

 C. Waghorne's No. 77 from Labrador, Pack's Harbor, July 28, 1892 (fr. 

 immat.; A., C). There is also a specimen collected by J. A. Allen in 

 Labrador, Carrol Cave, beside a brook, August 6, 1882 (No. 13; "sub- 

 erect or procumbent, about the size of 1 [S. cordifolia] or 6 [S. planijolia] 

 nearly or quite as procumbent as 1, a little less so than 6. Outside on 

 peaty soil, bank of a brook. Seems to come nearest 6, fruits all mixed 

 with male flowers or abortive"), and Chateau, August 11, 1S82 (No. 14; 

 "nearly erect about 2 feet; outside; stony or gravelly sea-shore, not 

 maritime, but at the nearest point to the shore producing plants not 

 maritime; resembles no. G"). If further observations should prove that 

 this interpretation is correct or that the forms in question represent a 

 distinct species or variety I think Allen's name should be connected with 



them. 



S. discolor x S. humilis. See Topffer, Salic, exsicc. fasc. vm. 298 

 Nos. 373-4(1913), and Knowlton and Deane in Rhodora, xvi. 108 (1914). 



S, discolor X S. pyrijolia. Fernald in Herb. Gray takes for this cross 

 a specimen collected by him on July 22, 1909, in Maine, Washington 



County, Princeton, with the parents in a swampy thicket (No. 1075; st.). 



? S. Eastwoodiae X S. Scoideriana (vol S. Lemmonii) . A plant collec- 

 ted by A. A. Heller in Nevada, Washoe County, Divide south of Slide 

 mountain, in granit, circ. 1500 m., July 5, 1913 (No. 10926, fr. submat.; 

 C.) may be regarded as a hybrid of S. Eastwoodiae with one of the two 

 other species. 



? S. exigua x S. melanopsis var. Bolanderiana. See Schneider in Bot. 

 Gaz. lxvii. 339 (1919). Besides the specimens there mentioned Heller's 

 No. 10882, Nevada, Washoe County, log railroad north of Verdi, June 

 24, 1913, (fr. vix mat.; A., G.) looks much like such a hybrid. 



? S. Geyeriana X S. subcoerulea. There have been collected by H. N. 

 Patterson in Colorado, Clear Creek County, wet places near Empire in 1885 

 several specimens (no. 23, st.; sheet no. 107473 in C; no. 24, sheet 107805, 

 C; no. 27, sheet 107474, C.) and also by W. N. Suksdorf, Washington, 



