The _Scrophularineæ_ differ mainly from the _Labiatæ_ in having round stems, and the ovary not splitting into separate one-seeded fruits. The leaves are also sometimes alternate. There are generally four stamens, two long and two short, as in the labiates, but in the mullein (_Verbascum_) (Fig. 120, _M_), where the flower is only slightly zygomorphic, there is a fifth rudimentary stamen, while in others (_e.g._ _Veronica_) (Fig. 120, _J_) there are but two stamens. Many have large, showy flowers, as in the cultivated foxglove (_Digitalis_), and the native species of _Gerardia_, mullein, _Mimulus_, etc., while a few like the figwort, _Scrophularia_ (Fig. 120, _H_), and speedwells (_Veronica_) have duller-colored or smaller flowers. [Illustration: FIG. 121.--_Anisocarpous sympetalæ_ (_Labiatifloræ_). _A_, flowering branch of trumpet-creeper, _Tecoma_ (_Bignoniaceæ_), × ¼. _B_, a single flower, divided lengthwise, × ½. _C_, cross-section of the ovary, × 2. _D_, diagram of the flower. _E_, flower of vervain, _Verbena_ (_Verbenæ_), × 2: i, from the side; ii, from in front; iii, the corolla laid open. _F_, nearly ripe fruit of the same, × 2. _G_, part of a spike of flowers of the common plantain, _Plantago_ (_Plantagineæ_), × 1; The upper flowers have the pistils mature, but the stamens are not yet ripe. _H_, a flower from the upper (younger) part of the spike. _I_, an older expanded flower, with ripe stamens, × 3.] The curious bladder-weed (_Utricularia_) is the type of the family _Lentibulariaceæ_, aquatic or semi-aquatic plants which possess special contrivances for capturing insects or small water animals. These in the bladder-weed are little sacs (Fig. 120, _P_) which act as traps from which the animals cannot escape after being captured. There does not appear to be here any actual digestion, but simply an absorption of the products of decomposition, as in the pitcher-plant. In the nearly related land form, _Pinguicula_, however, there is much the same arrangement as in the sundew. The family _Gesneraceæ_ is mainly a tropical one, represented in the greenhouses by the magnificent _Gloxinia_ and _Achimenes_, but of native plants there are only a few parasitic forms destitute of chlorophyll and with small, inconspicuous flowers. The commonest of these is _Epiphegus_, a much-branched, brownish plant, common in autumn about the roots of beech-trees upon which it is parasitic, and whence it derives its common name, "beech-drops." The bignonia family (_Bignoniaceæ_) is mainly tropical, but in our southern states is represented by the showy trumpet-creeper (_Tecoma_) (Fig. 121, _A_), the catalpa, and _Martynia_.