16 MASS. EXPERIMENT STATION BULLETIN 382 



Ceanolhus. Cuttings root readily in sand if taken in summer (105), Septem- 

 ber (51), or earlier. July cuttings of C. Dclilianus rooted 100 percent in 

 30 days after treatment with indoleacetic acid (100 mg./l., 24 hr.), 40 

 percent if untreated (87). Rooting of fall cuttings was hastened by treat- 

 ment with 20 mg./l., 24 hr. (113). 



Cedrus libani, cedar of Lebanon, is not easily propagated by cuttings (61) 

 although there is some rooting of those taken in the fall (80) Untreated 

 cuttings taken here in November rooted 30 percent in sand-peat, less 

 well in sand. 



Celastrus. Untreated softwood cuttings of American bittersweet root read- 

 ily in sand (125) but treatment may hasten rooting. July cuttings rooted 

 90 percent in 70 days without treatment and in half that time after treat- 

 ment with indolebutyric acid (50 mg./l., 20 hr.) (125). Their rooting wa>? 

 similarly hastened, 100 percent rooting in 50 days, by treatment with 30 

 mg./l., 6 hr. (83). Hardwood, April cuttings of oriental bittersweet pro- 

 duced more roots after treatment with indolebutyric acid (40 mg./l., 24 

 hr.), and there was even more benefit by naphthaleneacetic acid (48). 

 Equivalent concentrations of indolebutyric acid for treating hardwood, 

 winter cuttings of tliis species are 40 mg./l., 24 hr.; 2 mg./gm. talc; or, 

 by the concentrated solution-dip method, 1 to 4 mg./cc. (49). 



Ccphalaufhus occidentalis, buttonbush. Cuttings taken here in late July 

 and early August rooted 100 percent in sand-peat in one month whether 

 or not they were treated. Hardwood cuttings also root readily (51). 



Cercis, redbud. Softwood cuttings of C. chincnsis and C. canadensis which 

 were taken in June or July, or when one leaf of the new growth was al- 

 most full grown and the smallest leaves of CI canadensis were about a half 

 inch in diameter, rooted 75 to 90 percent in sand at 72° F. in about four 

 weeks (111). 



Chacuomclcs. Japan quince has been considered diflficult to propagate by 

 cuttings (113) but treated softwood cuttings, taken in late spring or early 

 summer, root well. Those which were taken here in early June, when 

 fruits were about a half inch in diameter, rooted at least 90 percent in 

 sand in four weeks after treatment with indolebutyric acid (12.5 mg./l., 

 24 hr.), not more than 30 percent without treatment. Rooting of July- 

 cuttings of C. japonica was hastened by treatment with naphthaleneacetic acid, 

 1:1000. in talc (104). 



Chaniaccyparis Lawsoniana, Lawson cypress, is easily propagated by fall 

 cuttings. Untreated, they rooted 90 percent or more in sand-peat when 

 taken here in October, equally well but more slowly when taken in Jan- 

 uary. Rooting of cuttings of the variety Fletcheri was improved by indole- 

 butyric acid 40 to 80 mg./l., 24 hr., or 12 mg./gm. talc (61). 



Chamaecypans obtusa, Hinoki cypress. Rooting of cuttings of the varieties, 

 sometimes poor otherwise, is better if they are treated with indolebutyric 

 acid (40 to 80 mg./l., 24 hr., or 12 mg./gm. talc) (61). Cuttings of the 

 varieties nana and compacta which were taken here in November rooted, 

 in sand-peat, not more than 40 percent in 12 months without treatment, not 

 less than 90 percent in 5 months after treatment (100 mg./l. , 20 hr.). Root- 

 ing of late December cuttings of the varieties niagnifica and filicoidcs was 

 similarly improved by SO mg./l., 24 hr. Cuttings of the varieties named 

 rooted in about the same percentages when taken here in October, November, 

 and December. Cuttings of the variety compacta which were taken here in 

 mid-July rooted 22 percent without treatment, 55 percent after treatment 



