Notes November 4 (Th)
Convolulaceae (Morning-glory family)
Poaceae / Gramineae (Grass family)
- Flowers pentamerous
- Petals fused
- Leaves simple (but Ipomoea quamoclit has finely dissected leaves)
- Corolla usually funnelform or salverform
- 5 stamens, epipetalous
- Single (compound) pistil
- Ovary superior
- Style one or two
- Fruit a capsule
- The most important plant family, economically (food sources)
- Stems ("culms") are round in cross-section, and typically hollow
- Leaves with basal sheath, homologous to petiole. Sheath is split longitudinally down the middle.
- Leaf blade
- "Ligule" between blade and sheath: often a thin membranous structure, or a series of hairs.
- Flowers highly reduced, no sepals, no petals.
- Flowers usually perfect (and plants synoecious) but some species have imperfect flowers (ex. Zea mays, corn, is monoecious)
- Flowers are maintained within "spikelets". The spikelet is the basic unit of the grass inflorescence.
- Generalized spikelet morphology includes a series of distichous, scale-like structures which embrace the flowers.
- Glumes (usually 2, sometimes only one, sometimes not present) at base of spikelet
- Lemma and palea embrace the flower
- Ovary made up of two carpels
- Single ovule within
- Matured ovary becomes fruit, or grain (= caryopsis)