STERCULIACEAE, TILIACEAE 213 



156. Malope L. 



534. M. grandiflora F. G. Dietr. (Knuth, ' Blutenbiol. Notizen.') This species 

 exhibits the same marked protandry as Malva. 



Visitors. On October 10, 1897, I observed Apis mellifica L., skg., in the 

 Garden of the Kiel Ober-Realschule. This insect dusted the under-side of its body 

 with pollen in flowers that were in the first stage, and transferred some of it to 

 the stigmas of flowers in the second stage. 



Schenck observed the fossorial wasp Crabro serripes Pz. in Nassau. 



XXI. ORDER STERCULIACEAE VENT. 



157. Pterospermum Schreb. 



535. P. acerifolium Willd. Lanza ('Note di biol. fior.,' 1894) states that this 

 species is protandrous in the Palermo Botanic Garden. The adynamandrous 

 blossoms are moth flowers. 



158. Cheirostemon Humb. et Bonpl. 



536. C. platanoides Humb. et Bonpl. Lanza (op. cit.) states that autogamy 

 cannot take place. The plants in the Palermo Botanic Garden never set fruits, 

 apparently because the appropriate pollinating agent does not occur there. 



159. Rulingia R. Br. 



537. R. pannosa R. Br. This species is protandrous (Urban, Ber. D. bot. 

 Ges., Berlin, i, 1883, pp. 53-6). 



538. R. corylifolia R. Grah.- This species is homogamous (op. cit.). 



539. R. parviflora Endl. The petals are yellowish- white at first, but become 

 rose-coloured after the pollen has been shed, as in Weigelia (op. cit.). 



XXII. ORDER TILIACEAE JUSS. 

 This family is represented in Europe by the genus. 



160. Tilia L. 



Flowers usually whitish, and belonging to class E. 



540. T. platyphyllos Scop. (=T. grandifolia Ehrh.) and 541. T. ulmifolia 

 Scop. (=T. parvifolia Ehrh.). (Sprengel, 'Entd. Geh./ pp. 275-6 ; Herm. Miiller, 

 Fertilisation,' pp. 146-7, ' Weit. Beob.,' II, p. 219; MacLeod, Bot. Jaarb. Dodonaea, 

 Ghent, vi, 1894, p. 227; Hildebrand, Bot. Ztg., Leipzig, xxvii, 1869; Kirchner, 

 'Flora v. Stuttgart,' p. 329; Knuth, *B1. u. Insekt. a. d. nordfr. Ins.,' pp. 48, 152 

 'Weit. Beob. u. Bl. u. Insekt. a. d. nordfr. Ins.,' ' Bloemenbiol. Bijdragen/) The 

 flower mechanism and visitors are the same in these two species, but the latter 

 blossoms about a fortnight later than the former. As the flowers are pendent, the 



