Notes o)t. Fol/eii. Bi/ Lord Avehni'i/. 503 



That of Erodium is also nearly spherical. The pollen of Oxalis 

 acetosella is oblong, 3-4 furrowed. The surface is almost smooth. 

 That of Tropcvolum is oblong with the furrows on the angles ; 

 in Impatiens hijiora it is oblong and granular, but the furrows have 

 almost disappeared. The grains are sometimes held together b}' a 

 few threads. Limnanthes has a very peculiar pollen ; it is U- or 

 A''-shaped with a broad base. There are three pores, one at the 

 base, one at the end of each arm. 



In colour the pollen of the Geraniacese is generally yellow, but 

 in G. pyrenaicum it is a dull leaden purple ; in Tropieolum majus 

 a rich orange. 



Aquifoliaue^e. — The pollen of the Holly is ellipsoid, oblong; 

 with three furrows, and densely covered with rounded knobs, resem- 

 bling pin-headed glands rather than the usual spines. 



Celastrace^. — The pollen of the Spindle tree is of the common 

 ellipsoid type, but the grains differ considerably in size. 



Ehamnace^. — The pollen is of the usual type, but with the 

 furrows in the angles, as in Tropcvolum, Veronica offidncdis, and 

 some other species. 



Sapindace.e. — The Sycamore and the Maple have pollen of the 

 ordinary ellipsoid type. The end view is nearly orbicular. 



Foreign species of the order seem in the main to agree. Most 

 species have smooth pollen, but Edgeworth figures that of Xantho- 

 ccras sorbifolia as spiny. 



Leguminose.e. — The pollen in this great family is in the main 

 of the ordinary elliptic form with three furrows. The ends are 

 sometimes tapering, sometimes truncate. The surface is sometimes 

 granular, sometimes netted, as in several species of Clover. 



The furrows are sometimes on the angles, as in some species of 

 jiEschynomene, Brownea, Lupinus, and Genista. Both forms occur in 

 Melilotus, in which genus also the pollen is sometimes dumb-bell 

 shaped. 



Petalostemon differs from its allies in having six furrows. 



In the Mimosese the pollen forms bundles generally of a definite 

 shape. Thus in Acacia platyptera the compound pollen resembles 

 a square biscuit, made up of twelve grains. 



It is remarkable that in the variety of Sweet Pea known as 

 Emily Henderson one strain has the common elliptic pollen, with 

 abrupt ends, while in another they are rounded. 



EosACE^. — The pollen of most Kosacese resembles that prevalent 

 among the Leguminosee. 



In cultivated Eoses the pollen is often very irregular in form 

 and size, and though produced in abundance seems deformed and 

 probably impotent. 



Poteriiim sanguisorba, however, differs from the rest of the 

 order in being wind fertilized, and it is interesting that the pollen- 

 grains assume a different character, being at first spherical (fig. 47), 



