J.INNEAN SOCIETY OE LOXDOX. 65 



Garnkr, W. W., ct H. A. Ai.LARi).— Effect of the relative length 

 of Day and Niglit and other Factors of the Environment on 

 Growth and I>eprodiiction in Plants. Washington: Journ. A'Tic. 

 liesearch, xviii. (1920i, ])p. o-'jo-OOC), pis. (j4 79. 



The Marsh and Spotted Orchids. 

 [Read (Uh May, 1920.] 



Mil. E. J. Bedford exhiliited a series of 30 water-colour drawings, 

 natural size, of the Marsh antl .Spotted Orcliids and tlieir varieties. 

 These were accompanied by a Dumber of detail drawings showing 

 the lips, pollinia, etc. The forms shown included Orchis incur- 

 iiata, L., from Hampshire and West Sussex, with the salmon-pink 

 or flesh-coloured flowers ; also a pale pink form with only the 

 slightest trace of markings on the lip : this came from a Middlesex 

 locality. 



A form with dull purple Howers and broad lip, leaves bright 

 green and unspotted. Tliis has been known hy some botanists as 

 ■O. incaniata, by others as 0. latifolia, and has receutlj" been named 

 0. prcetermissa by Dr. Gr. C. Druce. Specimens of this variety 

 were shown from Middlesex and East Sussex. 



Also a form (0. inccwnaia'?) with crimson-coloured flowers from 

 Westmorland, and two other varieties from the same locality with 

 •similar colouring but wider and flatter lips, sent to the writer as 

 ■0. iiicarnata var. pulchella, Druce. 



The Spotted Orchid was represented by three distinct forms. 

 The hrst, a vigorous plant with daric green heavily spotted leaves, 

 the labellum having a small and narrow centre division and 

 wide side ones ; this variety has recently been referred to as 

 0. maculatd, L., and is usually found in damp situations on heaths 

 or marshes on sandy soils. Tlie second form had similar foliage 

 to the tirst, but the labellum divided into three equal lobes with 

 the longest in the centre. This is known as \ar. triJohata on the 

 Continent, and has been named 0. Fuchnii by Dr. Druce. 



The third form was that known as 0. ericetorum, Linton, a much 

 less vigorous j)lant than either of the others, \\ith narrow leaves, 

 •and found usually in exposed situations on heaths and sandy soils, 

 often at considerable elevations. All these forms of the Spotted 

 Orchid are from East Sussex. 



'J'he following hybrids were shown : 0. incarnafa x prcetennissa, 

 0. in-cetermissa X incarnata, 0. prceiermissa X Fuchsil. In the detailed 

 drawings of the lip the exam])les shown testified to the enormous 

 difference of form and marl<ings assumed by each species, even in 

 tliose gathered at one time from the same restricted locality. 

 The various forms were also shown by a series of 70 lantern- 

 slides upon the screen, each variety being represented in situ • 

 (2) on a larger scale, and (3) enlarged houl nud side views of the 

 labellum. 



JAS^. SOO. PROCEEDINGS. — SKSSIOX 1919-1920. / 



