Contrary to earlier work, we maintain a distinction between endocarps with this kind of thick, bipartite plug-like operculum and, those with a bilabiate
opening, where the apical keel of the locular envelope and/or endocarp splits open, allowing the radical to exit (see below).
This improbable nutrient acquisition strategy is deployed by 19 genera from five orders and 12 families--with representatives among both the monocots and dicots, those with both radiate and bilabiate
corollas, as well as annuals, perennials, epiphytes and suffruticose life forms.
Isotriodon has dentate or entire leaves, terete stems, gibbous and bilabiate
Leaflets with both surfaces lepidote; calyx bilabiate
, lepidote, without nectaries; corolla yellow with red or brown nectar guides on the fauces ...
Petunia guarapuavensis has a large, evidently vertically bilabiate
stigma located at a level similar to the anthers of long stamens (Fig.
Its flowers are small, clustered into axillary inflorescences, hermaphrodite, pentamer, strongly zygomorphous and bilabiate
The anthesis lasted approximately 5 hours on sunny days or 9 hours on rainy days, the right wing covered the left wing, the corolla acquired a bilabiate
aspect, offering the left wing as landing platform; they produced a low quantity of nectar (0.18 [+ o -] 0.13 [micron]l); they did not receive pollinator visits; approximately four hours after the beginning of the anthesis on sunny days the ovary started to grow; in the bud, the receptive stigma was covered with germinating pollen grains from the same floral unit.
Mints are grouped together because they have several distinguishing characteristics such as square stems, wood leaves in pairs opposite on the stem and bilabiate
(two lipped) corollas (the flower petals).
The dried, bilabiate
calyx, with its lips pressed together, falls from the parent plant with the mericarps enclosed.