﻿JULY 1 TO OCTOBER 31, 1919. 37 



48035 to 48075— Continued. 



years would be required for full development. (Adapted from Don, Gen- 

 eral History of the Dichlamydeous Plants, vol. 2, p. 414, and Holland, 

 Useful Plants of Nigeria, pt. 2, p. 288.) 



48064. Acacia Senegal (L.) Willd. Mimosacese. 



A tree widely distributed in tropical Africa and cultivated in India. 

 It has pinnate leaves and long, dense, clublike racemes of tiny flowers 



> bristling with long stamens. This plant yields the true gum arabic of com- 

 merce, which is used for giving luster to crepe and silk, for thickening 

 colors and mordants in calico printing, in the manufacture of ink and 

 blacking, as a mucilage, and for confectionery and medicinal purposes. 

 The gum is more abundant in the dry season, exuding usually at the 

 forking of the branches. In Kordofan the gum is obtained from both 

 wild and cultivated trees, and in the gardens the trees are artificially cut 

 (strips of the outer bark being removed) shortly after the rains cease; 

 the first collection of gum is made about 60 days after cutting, and the gar- 

 den is completely picked over every fourth day thereafter until the rains 

 begin again and new leaves appear, at which stage the exudation ceases. 

 The period of production is given at from 3 to 20 years, beginning when the 

 trees are 3 or 4 years old and 8 feet in height. A plantation of about 10 

 acres has been estimated to yield from 1,200 to 1,500 pounds of gum in the 

 course of a season. (Adapted from Holland, Useful Plants of Nigeria, 

 pt. 2., p. 293, and Engler and Prantl. Die Natilrlichen Pflanzenfamilien, vol. 

 3, pt. 3, p. 112, fid- 68.) 



48065. Acacia stkicta (Andrews) Willd. Mimosacese. 



A shrub 3 to 6 feet high, with linear phyllodia. The paired axillary 

 heads of yellow flowers are borne freely in spring on short peduncles well 

 down from the leafy tips of the branches. The seedling first produces 

 4 or 5 pinnate leaves, then changes its leaf form and produces only 

 entire leaves. The wood is of a beautiful texture, sound and durable, 

 but too small for anything but a very limited use. Native to Tasmania and 

 southeastern Australia. (Adapted from Loddiges, Botanical Caoinet, 

 vol. 1, pi. 99, and Maiden, Useful Native Plants of Australia, p. 637.) 



48066. Acacia suaveolens (J. E. Smith) Willd. Mimosacese. 



A rather small species, native to Tasmania and eastern Australia, with 

 few and slender branches ; it frequently flowers when 2 years old. The 

 linear leaves are four times the length of the small axillary spikes, which 

 bear clusters of yellow flowers and red bracts. The flowers continue for 

 a long time and have a delicate, pleasing form and a very agreeable odor. 

 (Adapted from Bailey, Queensland Flora, pt. 2, p. 490.) 



48067. Acacia verticillata (Ait.) Willd. Mimosacese. 



A shrub 6 to 10 feet in height, recommended as a hedge and as an 

 ornamental. The solitary oblong spikes of yellow flowers, like fluffy 

 catkins, are borne in the axils of the whorled linear phyllodia. Native 

 to Victoria and Tasmania. (Adapted from Bentham, Flora AustraUensis, 

 vol. 2, p. 334.) 



48068. Acacia visco Lorentz. Mimosacese. 



An Argentine acacia, sparsely armed with recurved spines. The 

 smooth sessile flowers, with numerous, long stamens, form scythe-shaped 

 legumes which approach a maximum width of li inches. The leaves 



