102 



STAMENS. 



[SECTION 9, 



290. So anthers are generally two-celled. But as the pollen begins to 

 form in two parts of each cell (the anterior and the posterior), sometimes 

 these two strata are not confluent, and the anther eveu at maturity may be 

 four-celled, as in Moonseed (Fig. 296) ; or rather, in that case (the word 



cell being used for each lateral half of the 

 organ), it is two-celled, but the cells bilocel- 

 late. 



291. But anthers may become one-celled, 

 and that either by confluence or by suppres' 

 sion. 



292. By confluence, when the two cells 

 run together into one, as they nearly do in 

 most species of Pentstemon (Fig. 297), more 

 so in Monarda (Fig. 300), and completely 



in the Mallow (Fig. 29S) and all the Mallow family. 



Fig. 296. Stamen of Moonseed, with anther cut across; this 4-celled, or rather 4- 

 locellate. 



Fig. 297. Stamen of Pentstemon pubescens ; the two anther-cells diverging, and 

 almost confluent. 



Fig. 298. Stamen of Mallow ; the anther supposed to answer to that of Fig. 297, 

 but the cells completely confluent into one. 



Fig. 299. Stamen of Globe Amaranth ; very short filament bearing a single 

 anther-cell; it is open from top to bottom, showing the pollen within. 



Fig. 300-305. Stamens of several plants of the Labiate or Mint Family. Fig. 

 300. Of a Monarda : the two anther-cells with bases divergent so that they are 

 transverse to the filament, and their contiguous tips confluent, so as to form one 

 cell opening by a continuous line. Fig. 301. Of a Calamintha: the broad connec- 

 tive separating the two cells. Fig. 302. Of a Sage (Salvia Texana ; with long and 

 slender connective resembling forks of the filament, one bearing a good anther-cell ; 

 the other an abortive or poor one. Fig. 303. Another Sage (S. coccinea), with 

 connective longer and more thread-shaped, the lower fork having its anther-cell 

 wholly wanting. Fig. 304. Of a White Sage, Audibertia grandiflora; the lower 

 fork of connective a mere vestige. Fig. 305. Of another White Sage (A. stachy' 

 oides), the lower fork of connective suppressed. 



