354 DK. M, T. MASTERS ON A DOUBLE-PLOWERED ORCHIS. 



OpTirys aranifera^, wherein I stated that the only figure of a 

 double Orchis then known to me was in Jacob's ' Flora of Faver- 

 sham,' 1777, I have met with a paper of the late Professor 

 Morren, in Bull. Acad. Eoy. Belg. t, xix. part ii. p. l7l, accom- 

 panied by a figure. These flowers were untwisted, and evidently 

 owed their double condition to a substitution of petals for sta- 

 mens ; no prolification of any kind is mentioned. So fir as mere 

 outward appearance goes. Dr. Moore's specimens more nearly 

 resembled those of Jacob than those of Morren, but, as the former 

 gives no description, I have no means of comparing them J. 



EXPLANATION OP THE PLATES. 



Plate X. 



Fig- 1. Double flower of Orchis mascula^ * The situation of the axis. 

 Fig. 2. Cross section of the ovary. 



Fig. 3. Flower-bud in axil of petal of primary flower. 



Fig. 4. Petaloid stamen from the same flower. 



Fig. 4 a. Corresponding organ in another flower, showing vertical dehiscence 



of anther. 

 Fig. 5. Tubular petals belonging to the same whorl as fig. 4, and representing 



stamens. 

 Fig. G. Axillary bud from primary flower, sepals reflected to show inner organs. 

 Figs. 7, 7 «. Stamens from axillary buds. 

 Fig. 8. Pollen-mass from stamen fig. 7. 



Fig. 9. Tertiary floret formed in the centre of the secondary axillary flowers. 

 Fig. 9 a. Similar floret from another flower. 

 Fig. 10. Quaternary bud from the axil of sepal of tertiary floret. 



All the figures are magnified. 



» 



Plate XI. 



I, Diagram showing the arrangement of the several organs in the seven outer 

 circles of the flower. Each whorl is numbered, and the position of the 

 axillary buds shown. * The situation of the axis. 

 II. Diagram showing the theoretical structure of an OrcAw-flower (modified 



from Darwin). 



1, 1, 1. The three sepals. 



2, 2, 2. The three petals. 



A 1, A 2, A 3. The three outer stamens. 



a 1, a 2, a 3. The three inner stamens. 

 S, S, S. The three stigmas. 

 * The situation of the axis. 



t Journal of the Linnean Society, (Botany) vol. viii. p. 207. 



I Through the kindness of Dr. K. IJogg, I have this year (1866) been enabled 

 to examine another specimen of this double Orchis, gathered in the same lociJity 

 as that from which Dr. Moore's specimens were derived. Tlie structure was ui 

 all essential points identical with that above described. 



