6 POLLEN. 



two instead of three pores at each end) ; many of the Ver- 

 benacese, as Verbena (No. 105) and Lippia; while Stachy- 

 tarpheta is of large size (j^thof an inch), with its three pores, 

 containing large craters, figured by Fritzsche and Hassall. 



The Hydrophyllacese, and most of the Cucurbitacese, 

 finally, the very large Onagracese, which are well known and 

 described, also are trigonous, but in that family some of the 

 Fuchsias (F. thymifolium) have but two pores, like Banksia ; 

 and Epilobium roseum is compound, as described by Hassall. 

 The Dianella, Stypandra in Asparigineai, are also trigonous, 

 but in a very different nature, having a single cell with the 

 slit, so as to make a cocked-hat form, not with a pore in each 

 facet, as is the case in true trigonous pollen. 



Many have polyhedric pollens, each part having a pore, 

 sometimes smooth, sometimes echinate, as many Polygona, 

 the Caryophyllacese, Amaranthacese, Chenopodiacese, and 

 Alisma (No. 31). Many are globular ; some simple, as 

 Canna (No. 46), Costus, Musa (No. 45), Strelitzia ; some 

 smooth, some echinate, as Crocus* (No. 38), and Philesia 

 (No. 15), which are richly echinate, and the Potomagetons. 

 Some of the Nymphacese are echinate, as Nelumbium (Nos. 

 400-403) and the British species of Nymphsea, but the foreign 

 are simply 3-banded (Nos. 401-2). The Passiflorese, with large 

 pores, are beautifully portrayed by Fritzsche. The most 

 ornate are among the Synantherese, most of which are poly- 

 hedric or echinate, oval or globular, with three or more pores 

 in them ; a few are 3-slitted, as Artemisia (No. 213), and some 

 Centaurese (No. 218), and the Mutisacese (No. 209). 



The Malvaceae have large pollen, and many of the Con- 

 volvulacese; Cobsea and Mirabilis are among the largest I 

 know, and Cucurbita is one of the most beautiful (figured by 

 Fritzsche and Hassall and Pollenden, and well drawn by 

 Bauer, in the British Museum). 



Some of the Clerodendrons are globular, others nearly 

 square. Some of the Caprifolaciaceae and Bubiacese are 

 globular ; but they have many other forms, some large, some 



* In the genus Crocus, which always is globular, some species are quite 

 smooth and shining, others more or less echinulate ; while in C. mceaiavus, 

 according to Mohl, and in C. nivalis, the outer coat is spiral ; but it disappears 

 in water, the extine being thus invisible. 



