BOX-ELDERS, REAL AND SO-CALLED 14! 
trifoliolate, never deeply lobed, usually thin serrate or entire. 
The stamens are 8-10, and the flowers complete with a thick 
prominent extrastaminal disk. The stamens in Rulac are 4-6, 
the flowers apetalous and always diclinous, in different plants. 
The name is an anagram of Rulac. The following are known 
species, all oriental Asiatic. The genus may be considered somewhat 
closely related to Rulac and in the natural system would come 
between Acer and Rulac as the latter stands between the new 
genus and Dzpteronia Oliv., 1896. 
I. CRULA CISSIFOLIA (Sieb. & Zucc.) Nwd. 
Acer cissifolium (Sieb. & Zuce.) C. Kock, 1864. 
Negundo cissifolium Sieb. & Zucc., 1846. 
The plant is represented in the U. S. National Herbarium by 
No. 18106, collected by Tschonoski in Japan. It is a fertile flowering 
and fruiting specimen; some samaras having three wings. Also 
No. 136663 from Nikko (Mitsude-Kaide), May 9, 1879, collected 
by Matsumura. It has only stamen bearing flowers. No. 210532 
from Nanokawa, Tosa, July 18, 1892, has mature fruit. No. 
640126 was collected from the Agricultural Department Grounds, 
Washington, D. C. where it is cultivated. The branch is sterile. 
2. CRULA SUTCHUENSIS (Franch) Nwd. 
Acer sutchuense Franchi, 1894. 
3. CRULA TRIFLORA (Komarow) Nwd. 
Acer triflorum Komarow, 1901. 
4. CRULA MANDSCHURICA (Maxim.) Nwd. 
Acer mandschuricum Maxim., 1868. 
U. S. Nat. Herb. Specimen No. 18107 from Northeastern 
Manchuria, 1860, fruit in umbels. _N. Y. Bot. Gard. Herb. has a 
specimen, Wilson’s No. 1883. 
5. CRULA NIKOENSIS (Maxim.) Nwd. 
Acer nikoense Maxim., 1868. 
U. S. Nat. Herb. Specimen No. 18084. Kitch’s collected by 
C. S. Sargent, Oct. 17, 1892, at Nikko, Japan, has mature fruit. 
No. 18083 is a sterile specimen of the same. Tschonoski’s specimen 
No. 18030, U. S. Nat. Herb. has flowers and mature fruit, developed 
and undeveloped leaves. No. 18031 of the same with mature 
