14 MASS. EXPERIMENT STATION BULLETIN 382 



Amelanchier, shadbush, is not easily propagated by cuttings (51). Soft- 

 wood, summer cuttings of one species rooted 25 percent after treatment with 

 indoleacetic acid (50 mg./I., 24 hr.), 8 percent without it (65). There is 

 some evidence that A. canadensis can be propagated by hardwood cuttings 

 taken in April and set in a solar frame (85). 



Amorpha fruticosa. Softwood, July cuttings, made with the basal cut at 

 a node and planted untreated in sand, rooted 100 percent (116). 



Andromeda, bog-rosemary. Untreated cuttings of A. glaucophylla and 

 A. Polifolia which were taken here in January rooted 100 percent in 8 weeks 

 in sand-peat, less well in sand, and treatments with root-inducing sub- 

 stances were without effect. 



Airctostaphylos Uva-ursi, bearberry. Untreated cuttings taken here in Jan- 

 uary rooted 86 percent in sand in 12 weeks. February cuttings rooted 

 best, about 90 percent in 74 days, wlien multiple terminal cuttings (those 

 having three or more shoots on one branch) were treated and inserted in 

 sand-peat with bottom heat at 76° F. (22). Treated October cuttings 

 rooted better if made of basal parts of shoots rather than of their tips (48). 

 Effective concentrations of indolebutyric acid are 40 mg./l., 24 hr., or 

 12 mg./gm. talc (61). 



Aristolochia. September cuttings of one species, untreated, rooted 75 per- 

 cent in sand in 26 days (98). Dutchman's pipe is more readily propagated 

 by softwood, summer, than by hardwood cuttings (80). 



Aronia, chokeberry. Softwood, summer cuttings of red chokeberry root in 

 good percen*^ages (42). Cuttings of that species and of black chokeberry 

 gave best results when the basal cut was made a half inch below a 

 node (14). 



Berberis, barberry. Cuttings are taken in summer or fall. August cuttings 

 of B. Thunbcrgii (44), the basal cut a half-inch above the base of the current 

 season's growth (46), root readily in sand-peat. Cuttings of evergreen species 

 may well be taken later than those of the deciduous (105). There was 100 

 percent rooting of untreated cuttings of B. candidida and B. triacanthophora 

 which were taken here in late November and inserted in sandy soil, the 

 medium used for barberry cuttings in England (7, 105). December cuttings 

 of B. verruculosa rooted well in sand (67). Rooting of July cuttings of that 

 species was at least hastened by indolebutyric acid (83). Cuttings of B. 

 Sargentiana rooted 80 percent in 51 days after treatment with indolebutyric 

 acid (50 mg./l., 24 hr.), 60 percent without it (72). Hormodin No. 2 im- 

 proved rooting of cuttings of B. Julianae (102). 



Betula. Birches are not easy to propagate by cuttings (73), but treated 

 softwood cuttings will root to some extent. Summer cuttings of European 

 birch rooted 25 percent after treatment with indoleacetic acid (50 mg./l., 

 32 hr.), not at all without it (65). Cuttings of gray birch taken in July, 

 with the tenninal buds and all but one or two square inches of leaf area 

 removed, rooted 30 percent after treatment with indolebutyric acid (50 

 mg./l., 6 hr.); and cuttings of canoe birch rooted 50 percent after treat- 

 ment with indolebutyric acid (20 mg./l., 24 hr.) (1). 



Buddleia, butterfly bush, is easy to propagate by cuttings. Taken here in 

 late June or early July and inserted untreated in sand, cuttings of B. alterni- 

 folia rooted 83 percent and cuttings of B. Davidi rooted 100 percent. Treat- 

 ment with indolebutyric acid (33 mg./l.. 24 hr.) hastened the rooting of June 

 cuttings of B. alt ernif alia (114). 



