100 



STAMENS. 



SECTION 9. 



PetUadelphms. (five brotherhoods), when in five sets, as in some species 

 of Hypericum and in American Linden (Fig. 277, 289). 



Polyadelphom (many or several 

 brotherhoods) is the term generally 

 employed when these sets are several, 

 or even more than two, and the par- 

 tiouhir number is left unspecified. 

 These terms all relate to the fila- 

 ments. 



Syngenesious is the term to denote 



that stamens have their anthers united, 



coalesoeiit into a ring or tube ; as in 



Lobelia (Fig. 285), in Violets, and in 



all of the great family of Corapositse. 



284. Their Number in a flower is commonly expressed directly, but 



sometimes adjectively, by a series of terms which were the name of classes 



in the Linnaan artificial system, of which the following names, as also the 



preceding, are a survival : — 



Monandrous, i. e. solitary-stamened, when the flower has only one stamen, 



Biandrous, when it has two stamens only, 



Triaadrous, when it has three 



stamens, 



TetrandroMS, when it has four 

 stamens, 



Pentandrous, when it has 

 five stamens, 



Hexandrous, when with six 



stamens, and so on to 



„ ' , , -J. 1 289 290 



Polyamrous, when it has 



many stamens, or more than a dozen. i 



285. For which terms, see tlie Glossary. Tliey are all Greek numerals 

 prefixed to -andria (from the Greek), which Linnaeus used for andrwcium, 

 and are made into an English adjective, -androus. Two other terms, of 

 same origin, designate particular cases of number (four or six) in con- 

 nection with unequal length. Namely, the stamens are 



Didynamous, wken, being only four, they form two pairs, one pair longer 

 than the other, as in the Trumpet Creeper, in Gerardia (Fig. 263), etc. 



Fio. 286. Flower of a Mallow, with calyx and corolla cut away ; showing mona- 

 delplioiis stamens. 



Fig. 287. Monadelphous stamens of Lupine. 288. Diadelphous stamens (9 and 1) 

 of a Pea-tlossom. 



FlQ. 289. One of the five stamen-chisters of the flower of American Linden, with 

 accompanying scale. The five clusters are shown in section in the diagram of this 

 flower. Fig. 277. 



Fig. 290. Five syngenesious stamens of a Coreopsis. 291. Same, with tube laid 

 open and displayed. 



