ORGANS OF EEPRODrCTIOX. 245 



Fig. 522. Fig. 523. Fig. 524. Fig. 525. F/^. 526. 



J'jgi. 522 Anther of the Pyrola rotnndifoUa, suspended from the filament, /. 



I. Lociili openine hy two pores, p. Fi^. 523. Qundriloculnr anther of 



Poravihera, attached to filament, f. I. Loculi opening by pores, p. 



Fig.h2i. Anther of Tefrntheca jnncea, opening by a single pore at the 



apex. The^e figures are from Jussieu. Fig.52o. Anther lobes of a 



species of Solnnum opening hy pores at the apex. Fig. 526. Anther 



of Barberry {Berberis vulgaris) opening by two valves. 



duee pores or short slits. In such anthers there is commonly no 



trace of the sutures to be seen externally. The pores or slits 



may be either situated at the apex, as in 



the Nightshade (Solanum) (fig. 525), and Fig. 527. 



Milkwort {Jig. 501) ; or laterally, as in the 



Heaths (fg. 518, r). There may be either 



two pores, as is usually the case {fg. 522), 



or four, as in Poranthcra {fg. 523), or 



many, as in the Mistletoe, or only one, as 



in Tetratheca jiincea {fig. 524). 



4. Valvular. — This name is applied when 

 the whole or portions of the face of the an- 

 ther open like trap-doors, which are at- 

 tached at the top and turn back as if on a 

 hinge. In the Barberry {Berberis) {fig. 

 526), there are but two such valves, 

 while in the Sassafras and other plants 

 belonging to the Laurel family, there are 

 four, that is, two to each lobe, placed in 

 pairs one over the other {fig. 527). 



The Stamens genehallt, or the An- 

 DRCECiiiM. — Before describing the pollen p,-^ 

 which is contained w^ithin the anther, it 

 will be better for us to take a general view 

 of the stamens as regards their relations 

 to one another, and to the other whorls of 

 the flower. "We shall consider this part of 

 our subject under four heads, namely : — 1. Number, 2. Insertion 

 or Position, 3. Union, 4. Relative length. 



1. Number.— The number of stamens is subject to great varia- 



.527. Stamen of a 

 species of Latirw. f. 

 Filament, with two 

 fflands g, g, at its 

 base. I, I. Loculi, of 

 which there are four. 

 V. Valves. 



