18 MASS. EXPERIMENT STATION BULLETIN 382 



a heel (46), more quickly with four leaves than with two (111); but if 

 there is much danger of wilting, half the leaves may well be removed 

 (57). Cuttings root well in sand (57, 111), sometimes better in sandy 

 soil. Taken here in early June, they rooted 47 percent in sand, 64 percent 

 in sandy soil without treatment; IZ percent in sand, 95 percent in sandy 

 soil in 34 days after treatment with indolebutyric acid (12.5 mg./l., 24 hr.). 

 Other effective concentrations are 10 mg./l., 24 hr. (57) or 5 mg./gm. 

 talc. (49). 



Cornus Kousa has not been considered easy to propagate by cuttings (64) 

 but, treated, they root fairly well in sandy soil. Taken here in early July, 

 untreated cuttings rooted 20 percent in sand, 53 percent in sandy soil; 

 and those treated with indolebutyric acid (25 mg./l., 24 hr.) rooted, in 

 8 weeks, 62 percent in sand, 82 percent in sandy soil. Tips of shoots 

 make good cuttings (105). 



Cornus mas, Cornelian cherry, is less readily propagated by cuttings than 

 some dogwoods (116), although they root sometimes fairly well in sand 

 (44, 66), better in sandy soil. L^ntreated cuttings which were taken here 

 in mid-July rooted only 25 percent in either medium; those which had 

 been treated with indolebutyric acid (25 mg./l., 20 hr.) rooted 100 per- 

 cent in sandy soil, but no better than the untreated in sand. 



Cornus raccmosa. Cuttings rooted 66 percent following treatment with 

 indolebutyric acid (80 mg./l, 4 hr.), much less well without it (125). 

 Rooting of July cuttings was improved by naphthaleneacetic acid dust, 

 1:1000 (102). 



Cornus sangiiiitca, red dogwood. Late June cuttings rooted 68 percent in 

 3 weeks after treatment with indolebutyric acid (30 mg./l., 12 hr.), 44 

 percent without it (83). 



Cornus stolonifera, red-osier dogwood. Hardwood cuttings, treated or not, 

 rooted 90 percent in 8 weeks when taken here in mid-April and imme- 

 diately set in the field. Softwood cuttings, whether or not they were 

 treated, rooted 100 percent in 5 weeks when taken here in early August. 



Coronilla Emeriis, scorpion senna. Summer (51) or early fall cuttings root 

 in sand without difficulty (105). Taken here in early September and early 

 October, untreated cuttngs rooted about 70 percent. 



Corylopsis, Softwood, late spring cuttings root well if taken while young 

 shoots are still growing (107). Untreated cuttings of C. pauciflora which 

 were taken here in early and mid-June, with basal cut at base of the current 

 year's growth, rooted 100 percent in sand-peat in 8 weeks, less well in sandy 

 soil. Summer cuttings of C. Willmottiae rooted about 60 percent more after 

 treatment with indolebutyric acid (17 mg./l., 24 hr.) than did untreated 

 cuttings (113). 



Corylus, hazel. Hardwood, early spring, cuttings of European hazel will 

 root if kept fresh and in good light after leaves appear (128). Softwood, 

 summer cuttings rooted 22 percent after treatment with indoleacetic acid 

 (100 mg./l., 24 hr.), not at all without it (65). Mid-July cuttings of a 

 filbert rooted 52 percent in 58 days after treatment with indolebutyric 

 acid (4 mg./gm. talc), not at all meanwhile without treatment (104); and 

 mid-June cuttings of European hazel responded to treatment with indole- 

 butyric acid, 5 mg./gm. talc (49). 



Cotoneastcr. Softwood cuttings are taken in late spring or early summer. 

 Untreated cuttings of C. dwaricata rooted 100 percent in 7 weeks when taken 



