We are studying the dicots first, then the monocots. Magnoliidae
is the first dicot subclass; subclasses are made of families. Unifying
characters of the Magnoliidae are mostly primitive ones: often woody, flowers
usually showy and with many parts, apocarpy common, etc.
1. Magnoliaceae-Many primitive characters: woody,
simple alternate leaves, showy flowers, long floral axis, poorly developed
style and stigma, leaf-like stamens, spiral arrangement of parts, apocarpy,
etc. Ex.: Liriodendron-Tulip Truee with fruit an aggregate of
2. Nymphaeaceae-Aquatic herbs with peltate leaves.
Perianth parts numerous, similar; stamens leaf-like. Ex.: Nymphaea-Watelily.
3. Ranunculaceae-Crowfoot Family. Herbaceous, fewer
perianth parts, differentiated perianth. Still has some primitive features-poorly
developed style and stigmas, many stamens, actinomorphy, apocarpy.
Ex.: Ranunculus with fruit a cluster of achenes.
4. Papaveraceae-Poppy Family. Herbaceous. Has some advanced features: fewer parts, syncarpy, adnation of stamens and corolla. Fruit a poricidal capsule. Ex.: Papaver (poppy) and Eschscholzia (California Poppy)-both have sepals that fall off as the flower opens so that in a mature flower only the ring where they were attached shows.
Back to the Magnoliidae lab exercise
last modified Sept. 27, 2000 by MDR