LABURNUM 



Laburnum, Linnaeus, Syst. Nat. 4 (1735); Medicus in Vorl. Churfurstl. Ges. ii. 363 (1787); Grise- 

 bach, Spicil. M. Rum. i. 7 (1843); Bentham et Hooker, Gen. PL i. 481 (1865); Schneider, 

 Laubhohkunde, ii. 37 (1907). 



Cytisus, Linnaeus, section Laburnum, Wettstein, in Oesterr. Bot. Zeitschrf. xl. 435, t. iv. (1890), and 

 xli. 127, 261 (1891). 



Deciduous small trees or shrubs, belonging to the division Papilionaceae of the order 

 Leguminosae. Leaves alternate, compound, with three stalked leaflets, and more or 

 less persistent stipules. Flowers yellow, in terminal racemes ; calyx campanulate, 

 two-lipped, the upper lip with two short teeth, the lower lip with three short teeth ; 

 standard ovate or orbicular, erect ; wings obovate ; keel incurved, shorter than the 

 wings ; stamens monadelphous, five short versatile anthers alternating with five basi- 

 fixed anthers ; ovary stalked, ovules numerous ; style glabrous, incurved, with a 

 terminal stigma. Pod linear, flattened, stalked. Seeds without an excrescence at 

 the hilum. 



This genus comprises three species, one of which L. caramanicum, Bentham 

 and Hooker, a native of Greece and Asia Minor, is a low shrub, which need not be 

 further alluded to. (A. H.) 



LABURNUM ALPINUM, Alpine Laburnum 



Laburnum alpinum, Berchtold and Presl, Opir. Rost. iii. 99 (1830-1835); Grisebach, Spicil. Fl. 



Rum. i. 7 (1843); Schneider, Laubholzkunde, ii. 39 (1907). 

 Cytisus alpinus, Miller, Diet. ed. 8, No. 2 (1768)5 Loudon, Arb. et Frut. Brit. ii. 591 (1838). 

 Cytisus angustifolius, Moench, Meth. 145 (1794). 



A tree similar in size, bark, and mode of branching, to L, vulgare. Young 

 branchlets glabrous. Leaves similar to those of L. vulgare, but with glabrous 

 petioles ; leaflets more variable in shape, oval, oblong, or even obovate, acute 

 and mucronate at the apex, entire in margin ; dark green and glabrous above ; 

 light green and glabrous beneath, except for a few long hairs on the base of 

 the midrib. 



Flowers in long and slender racemes, — smaller, paler yellow, and opening later 

 than those of Z. vulgare; calyx and pedicels glabrous. Pod, about i^ to 2 in. long, 

 glabrous, with the upper suture winged ; seeds brown. 



1521 



