"^ PROPAGATION OF TREES AND SHRUBS 17 



with indolebutyric acid (25 mg./l., 16 hr.). Untreated cuttings of the variety 

 filicoides rooted better in sand-peat than in sandy soil, better in sandy soil 

 than in sand. 



Chauiaccyparis pisifcra. Sawara cypress. Cuttings of the variety plumosa 

 rooted well in sand-peat or sand if taken in November or December, less 

 well if taken in February (31). Treated cuttings rooted equally well in 

 sand-peat when taken here in October, November, or December, less well 

 in sand. Effective treatments for cuttings of five varieties were indolebutyric 

 acid 40 to 80 mg./l., 24 hr., dr 12 mg./gm. ta)lc (61). Cuttings of the va- 

 rieties filifcra and squarrosa which were taken here in late November rooted 

 90 to 100 percent after treatment with indolebutyric acid (75 mg./l., 24 hr.), 

 45 to 63 percent, and more slowly, without treatment. October cuttings of 

 the variety plumosa rooted 100 percent in 12 weeks with that treatment and 

 in 19 weeks without treatment. 



Chamaccyparis thyoidcs, white cedar, has not been easy to propagate by 

 cuttings (5), but cuttings which were taken here in mid-November and 

 treated with indolebutyric acid (125 mg./l., 24 hr.) rooted 96 percent in 

 sand-peat in 6 months. Results were less good with lower concentra- 

 tions, and only ii percent of the untreated cuttings rooted. 



Chiogcnes bispidula. creeping snowberry. Cuttings root readil}*. Taken 

 here in mid-July and not treated, they rooted 100 percetu m sand-peat in 

 8 weeks, less well in sand. 



Cladrastis lutea, yellow-wood. Untreated softwood, summer cuttings rooted 

 100 percent in sand-peat in 6 weeks (87). 



Clematis. Cuttings are taken in summer, late summer in the case of most 

 of the small-flowered kinds (71). Untreated cuttings of C. lanuginosa, in 

 sand or sandy soil, rooted more than 90 percent in 45 days when taken here 

 in late June and early July. Cuttings of C. Lawsoniana and C. tangutica are 

 successfully taken in July (116). Cuttings root equally well with the basal 

 cut made at a node or between two nodes, and single node, internodal, cut- 

 tings of the large-flowered sorts give good results (71). June cuttings of 

 C. vedraricnsis which had been treated with indolebutyric acid (33 mg./l., 

 24 hr.) rooted 75 percent more in 3 weeks than did untreated cuttings. In- 

 doleacetic acid (100 mg./l., 18 hr.) hastened the rooting of cuttings of C. 

 vwntana var. rubcus (20). 



Clcthra alnifolia, sweet pepperbush. Summer cuttings root readily (113), 

 up to 100 percent in sand-peat, less well in sand, without treatment (66) 

 but treatments may hasten rooting. Late June cuttings rooted 100 per- 

 cent in 20 davs after treatment with indolebutyric acid (10 mg./l., 24 

 hr.) (57). 



Coriaria. Early July cuttings rooted 85 percent in sand in 18 days after 

 treatment with naphthaleneacetic acid (1:1000, in talc), about 57 percent 

 without treatment (97). 



Cornus alba. Late June cuttings rooted 80 percent in 30 days after treat- 

 ment with indolebutyric acid (50 mg./l., 24 hr.), not at all meanwhile 

 without it (57). 



Cornus Amomiim. July cuttings rooted so well without treatment that the 

 only result of treatment (indolebutyric acid 30 mg./l., 20 hr.) was more 

 roots per cutting (125). 



Cornus florida, flowering dogwood. L^ntreated cuttings rooled 100 percent 

 in 3 weeks if taken in spring when flowering period was ending, less well 

 if taken later (111). June cuttings rooted equally well with or without 



