' 11EA\ a. HENSLOAV ON THE STEVCXXJIIE OF INDIGOFERA, 355 



III. Diagram to explain the construction of the double-flowered Orchis. 



1. Tlie primary flower, with no median bud, the position of which, had 



it been present, is shown by the dotted Jine. 



2. One of the axillary buds proceeding from 1, and itself giving 



origin to 



3. Median bud, and 3', 3', axillary buds. 



4', 4'. Axillary buds, proceeding from 3. No median bud is produced 

 from 3 J what "would be its situation is indicated by the dotted 

 line. 



^te on the Structure of Indigqfera^ as apparently offering fact- 

 lities for the inteix^rossin^ of distinct flowers. Bv the Kev. 

 G-EORGE HEis'SLcJl^r, M.A., F.L.S. [With additional JN'otice of 

 Dr. HriiOEBKAXn's Paper on MedicagOy Indigofera^ and CytisuSy 

 in the Botanische Zeitung, March 1866 ; and a Commuuicatiou 



Mr 



[Kead April 19, 1866.] 



TuE structure of the flowers of Jndigofera speciosa is as fol- 

 lows : — 



The vexillum is orbicular, and inserted by a very short claw, 

 "wliich is nearly at right angles to the expanded lamina. 



Tlie claws of the alae are short, and, near the expanded portions 

 of the petals, somewhat broad ; each claw terminates in two 

 points, the lower being that by \\ hich this petal is inserted, the 

 upper points, which are bluntest, converge towards, aiid meet 

 together at, the point of insertion of the vexillum. A superficial 

 ridge runs down the exterior surface of each claw, and terminates 

 in the upper and blunt extremity. The entire inner margins of 

 the alary petals, wliich are somewhat thickened or involute, touch 

 each other over the staminal tube. The expanded portions of 

 the alee are somewhat rhomboidal in form, and stand in a hori- 

 zontal position, being elevated by two horn-like projections which 

 spring from the exterior surfaces of the carinal petals. 



The carina is boat-shaped, and inserted by a rather broad claw ; 

 there are superficial depressions on the exterior surface, to which 

 the involute margin of tlie alse slightly cohere. Two horns pro- 

 jecting upwards and backwards, as already mentioned, support the 

 ahe. 



The carina entirely includes the stamens and pistil, the style 

 and stigma of which extend considerably beyond the anthers. 

 If any object, such aa a pin, be inserted at the base of the vex- 



