Fig. 260), the Lupine (Fig. 287), and in Lobelia (Fig.
285).

[Illustration: Fig. 285. Flower of Lobelia cardinalis, Cardinal flower;
corolla making approach to the ligulate form; filaments (_st_)
monadelphous, and anthers (_a_) syngenesious.]

[Illustration: Fig. 286. Flower of a Mallow, with calyx and corolla cut
away; showing monadelphous stamens.]

[Illustration: Fig. 287. Monadelphous stamens of Lupine. 288.
Diadelphous stamens (9 and 1) of a Pea-blossom.]

_Diadelphous_ (meaning in two brotherhoods), when united by the
filaments into two sets, as in the Pea and most of its near relatives
(Fig. 288), usually nine in one set, and one in the other.

_Triadelphous_ (three brotherhoods), when the filaments are united in
three sets or clusters, as in most species of Hypericum.

_Pentadelphous_ (five brotherhoods), when in five sets, as in some
species of Hypericum and in American Linden (Fig. 277, 289).

_Polyadelphous_ (many or several brotherhoods) is the term generally
employed when these sets are several, or even more than two, and the
particular number is left unspecified. These terms all relate to the
filaments.

_Syngenesious_ is the term to denote that stamens have their anthers
united, coalescent into a ring or tube; as in Lobelia (Fig. 285), in
Violets, and in all of the great family of Compositae.

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 Linnaean 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,

_Diandrous_, when it has two stamens only,

_Triandrous_, when it has three stamens,

_Tetrandrous_, when it has four stamens,

_Pentandrous_, when it has five stamens,

_Hexandrous_, when with six stamens, and so on to

_Polyandrous_, when it has many stamens, or more than a dozen.

[Illustration: Fig. 289. One of the five stamen-clusters of the flower
of American Linden, with accompanying scale. The five clusters are shown
in section in the diagram of this flower, Fig. 277.]

[Illustration: Fig. 290. Five syngenesious stamens of a Coreopsis. 291.
Same, with tube laid open and displayed.]

285. For which terms, see the Glossary. They are all Greek numerals
prefixed to _-andria_ (from the Greek), which Linnaeus used for
_androecium_, and are made into an English adjectiv