CHENOPODIACEAE 333 



Kirchner agrees with these observations of Volkens, though without extending 

 the assumption of entomophily to all species of the order. He also observed a slight 

 secretion of nectar in the bases of flowers belonging to Chenopodium album L. 

 growing in sunny places. There is a fair amount of nectar in Chenopodium 

 Vulvaria L. 



755. Suaeda Forsk. 



Flowers hermaphrodite and devoid of nectar. 



2425. S. maritima Dumort. (= Chenopodina maritima Moq., and Cheno- 

 podium maritimum Z.). (Warming, ' Ekskursioner ' ; Knuth, 'Bl. u. Insekt. a. d. 

 nordfr. Ins./ p. 126.) The flowers of this species are homogamous or feebly 

 protandrous. Automatic self-pollination is easily possible. 



756. Salsola L. 



As Suaeda. 



2426. S. Kali L. (Kirchner, Jahreshefte Ver. Natk., Stuttgart, xlix, 1893, 

 p. no ; Knuth, 'Bl. u. Insekt. a. d. nordfr. Ins.,' p. 126, ' BI. u. Insekt. a. Helgoland,' 

 p. 32.) This species is homogamous or protogynous. Automatic self-pollination is 

 possible. Kirchner says that the stigma projects from the flower bud. In Helgoland 

 I found the flower homogamous, but the stigma, which is strongly papillose all the 

 way round at the top, though only on the inner surface lower down, is still receptive 

 after the anthers have dehisced. The latter project beyond the stigma, automatic 

 self-pollination being therefore possible by the fall of pollen. Although the five 

 filaments are stiff, the pollen is easily dispersed, being very fine. The plant is 

 therefore predominantly anemophilous, though occasional iilsect-visits are not ex- 

 cluded. 



Kirchner also considers this species entomophilous. He describes the two 

 filiform stigmas as projecting from the flower bud, and the perianth as only opening 

 to set the quickly elongating stamens free, when the anthers are shrivelled. The 

 white filaments are erect, and the yellow pollen scattered by the anthers (which are 

 of the same colour) is not powdery, but clings somewhat together. Secretion of 

 nectar could not be observed. Occasionally the anthers dehisce before the stigmas 

 are shrivelled, in which case automatic self-pollination is possible. 



Wamstorf describes the pollen-grains as sulphur-yellow in colour, rounded 

 polyhedral, their surface divided into regular pentagonal and hexagonal areas, 

 separated by depressions, and 25-31 fj, in diameter. 



Visitors. Plateau observed po-dvg. hover- flies (Eristalis arbustorum Z., and 

 Syritta pipiens Z.). 



2427. S. Soda L. The flowers of this species are pale green in colour. 

 Visitors. Plateau observed a hover-fly (Syritta pipiens Z.) and minute 



Muscids. 



2428. S. crassa Bieb. 



Visitors. Plateau observed Syritta pipiens L., and other po-dvg. hover-flies. 



