Tas. 7-499, 
LATHYRUS onpburatvs. 
Native of the shores of the Dardanelles. 
Nat. Ord. Lecuminosa.—Tribe Victrz. ¢ 
Genus Latuyrrus, Linn. ; (Benth. & Hook. f. Gen. Plant. vol. i. p. 526.) 
Latayrus (Eulathyrus) uxdulatus; perennis, glaberrimus, caulibus anguste 
s=. alatis, stipulis semisagittatis 2-partitis segmento antico subulato-lanceo- 
fie late defiexo incurvo, postico parvo subulato erecto, petiolo angustis#ime 
alato in stipitem gracilem apice cirrhiferam producto, foliolis unijugis 
ovatis mucronatis 5-9-nerviis marginibus undulatis, subtus glaucis 
nervis prominentibus, flexuosis anastomosantibus, pedunculis folia 
superantibus strictis 5~7-floris, calycis lobis tubo subequilongis lanceo- 
latis recurvis, corolla purpureo-violacea, ovario pubescente, legumine 
longe lineari apice incurvo attenuato rostrato sutura superiore carinata, 
seminibus oblongis rugulosis. 
L, undulatus, Boiss. Diagn. Pl. Or. Ser. I. pars. ii. p. 41; Fl. Orient. vol. ii. 
p- 611. ‘ 
L, latifolius, Stbth. & Sm. Prodr. Fl. Graec. vol. ii. p. 69 (non Linn.). 
L. Sibthorpii, Baker (ex Hort.) in Gard. Chron. (1890) vol. i. p. 704. 
Lathyrus undulatus is a critical species, being very 
closely allied to the oriental L. rotundifolius, Willd., and 
to the Western European L. latifolius, Linn., with which 
latter Sibthorp confounded it. Of these L. rotundifolius 
(Tab. 6522) is easily distinguished by its much larger size 
and stouter habit, broader leaflets, much larger broader 
stipules, numerous crowded smaller flowers of a dull rose 
colour, and short calyx-lobes. JL. latifolius (regarded by 
some botanists as a variety of L. sylvestris, L.) has lan- 
ceolate leaflets, and numerous much larger violet-purple 
flowers with a green keel. 
L. undulatus has been Jong known in cultivation under the 
garden name of L. Sibthorpit (which Mr. Baker has adopted), 
and which seems to indicate that it was introduced by 
Sibthorp, who certainly was its discoverer, into the 
Oxford Botanic Gardens. According to Mr. Hinds of 
Newton Abbot, whose observations are given by Mr. 
Baker in the Gardener’s Chronicle, it flowers from a fort- 
OcTOBER Ist, 1896, 
