LEGUMINIPER^. 101 



GUNUS XVII.— Ij a T H Y R U S. Zinn. 



Calyx campanulate, 5 - toothed, the 2 upper teeth shorter. 

 Standard sub-orbicular, spreading, at right angles to the rest of 

 the flower. Stamens diadelphoiis, or sub-monadelphous, -with the 

 tube transversely truncate. Style bent upwards at riglit angles to 

 the ovary, or curved towards the standard ; channelled at the base, 

 dilated and compressed toward the apex, hairy on the upper or 

 inner side (sometimes apparently on the lower from the style twist- 

 ing on its own axis). Pod elongated compressed, rnany-seedcd. 



Herbs, generally climbing, and scarcely distinguishable from the 

 genus Vicia by their habit, though generally the leaflets are much 

 larger, and only in one or two pairs ; sometimes there are none. 

 Flowers on elongated axillary peduncles, solitary, subsolitary, or 

 racemose, generally large, with a very broad spreading lamina to 

 the standard. 



The origin of the name of this genus of plants is somewhat obscure. One author 

 says it comes from Xaflupoc of Theophrastus, which is said to be from ,\a (la), augmen- 

 tative, and Odvpoc (ihouros), anything exciting, in reference to the qualities of the seeds. 

 Another writer suggests that it comes from XnBo), "to lie hidden ;" but that does not 

 obviously apply to the habit of the plant. 



Section I.— APHACA. Tonmef. 



Petioles reduced to tendrils. Leaflets only present on the first 

 leaves of seedlings, and not always even there. Calyx-tube equal 

 and attenuated at the base ; teeth longer than the tube. 



SPECIES I.— LATHY RUS APHACA. im»». 

 Platk CCCXCVII. 



Root annual. Stem climbing or trailing, angular, not winged. 

 Leaflets none. Tendrils branched or simple. Stipules very large, 

 ovate, truncate and slightly hastate or hastate-sagittate at the base 

 with short auricles, obtuse at the apex. Peduncles axillary, 1- 

 flowered. Flowers erect. Calyx - teeth strapshaped - lanceolate, 

 nearly equal, much longer than the tube. Corolla not much 

 longer than the calyx. Pods linoar-oblong, compressed, falcate. 



In cultivated ground, and waste places which liave been recently 

 disturbed ; rare. In Devonshire, Dorset, Sussex, and Kent> north- 

 ward to Worcestershire, Warwickshire, and Lincolnshire. 



England. Annual. Earlv Summer to Autumn. 



