Robinia ^497 



pubescent, minutely apiculate. Stipules persisting as glabrous hard woody- 

 spines. 



2. Robinia neomexicana, Gray. See p. 1 506, 



Branchlets densely pubescent. Leaflets pubescent, tipped at the acute apex 

 with a long mucro ; stipels mostly persistent. Stipules persistent as slightly 

 pubescent hard woody spines. 



1 1 . Branchlets glandular. 



3. Robinia viscosa, Ventenat. See p. 1507. 



Branchlets with short-stalked glands, exuding a viscid matter. Leaflets 

 pubescent, shortly apiculate. Stipules usually deciduous, occasionally persistent 

 as slender short spines. 



4. Robinia hispida, Linnaeus. See p. 1508. 



Branchlets with glandular bristles and dense pubescence. Leaflets glabrous, 

 except for slight pubescence on the midrib beneath. Stipules usually 

 deciduous, occasionally persistent as minute blunt spines. (A. H.) 



ROBINIA PSEUD ACACIA, False Acacia, Locust 



Robinia Pseudacacia, Linnaeus, Sp. PL 722 (1753); Cobbett, Woodlands, Nos. 322-398 (1825); 

 Loudon, Arb. et Frut. Brit. ii. 609 (1838); Withers, The Acacia Tree (1842) j Wilkomm, 

 Forstliche Flora, 930 (1887); Sargent, Silva N. Amer. iii. 39, tt. 112, 113 (1892), and Trees 

 N. Amer. 572 (1905); M.2A\i\t\ii, Flore Forestiire, 119 (1897); Schneider, Laubholzkunde, ii. 

 82 (1907). 



Robinia fragilis, Salisbury, Prod. 336 (1796). 



Pseudacacia odorata, Moench, Meth. 145 (1794). 



A tree, attaining about 80 feet in height and 15 feet in girth. Bark thick, 

 brownish, with broad and deep longitudinal fissures, separated by scaly ridges. 

 Young branchlets, at first slightly pubescent, soon becoming glabrous. Leaf-rachis 

 slightly pubescent. Leaflets, nine to nineteen, elliptic or oval, rounded at the base ; 

 rounded, truncate or emarginate at the apex, which terminates in a minute mucro ; 

 upper surface covered with minute appressed pubescence, lower surface paler with 

 scattered hairs ; petiolule, \ in., slightly pubescent ; stipels linear, ^ in., early 

 deciduous. 



Flowers in loose pubescent non-glandular racemes ; pedicels slender, \ in. 

 long, pubescent ; calyx gibbous, pubescent, the lowest lobe acuminate and longer 

 than the others ; petals white, with a greenish yellow patch on the middle of the 

 inner surface of the standard. Pod, 2 to 4 in. long, glabrous, persistent on the 

 leafless branches late in winter ; seeds usually four to eight. 



The stipules,^ at first linear, subulate, membranous, pubescent, and about \ in. 

 long, are either deciduous or develop into spines, which persist for several years and 

 occasionally attain f in. in length. These spines are glabrous, triangular, com- 



1 Cf. Colomb, in Ann. Sc. Nat. vi. 65 {1887). 



