- Well-developed vasculature is dispersed throughout the lodicule, similar to petals
(although the vascular architectures differ), which is necessary to enable rapid and
uniform swelling of the lodicule at anthesis. Rapid swelling of the lodicule cuases flower
opening by mechanistically separating the lemma from the palea. Both vascular
differentiation and the positioning at the base of a flower and the thick structures are
necessary for lodicules to cause flower opening.
- 85 genera/2000 spp. (Kalkman 2004), subcosmopolitan, temperate, especially N temperate
- Trees, shrubs, and herbs. Leaves simple, compound, or dissected, usually spirally arranged.
- Stipules usually present (but not in Spiraeoideae), often joined to the petiole
- What’s special in human terms?
Sometimes used to stop bleeding during childbirth
Used to control symptoms of heart disease
Ornamental and scent plant
- Subfamily of roses:
Includes plums, peaches, almonds
- What’s special biologically?
Dioecy has arisen more than once (e.g. Kageneckia, Maddenia, Oemleria, Rubus
Gametophytic apomixes in many groups
Limited barrier to hybridization in some groups
X = 7, 8, 9, 15, 16, 17 Polyploidy frequent
Polyploidy means that you have more than two pairs of chromosomes
Wildlife cover, food
Nitrogen fixing symbioses in some groups
Few, if any, defining characteristics for the entire family
Variation in fruit type seized upon as a basis for subfamilial classification
- Rosaceae flowers usually perfect, perigynous or (in Pyrony???) epigynous.
- K , often appearing as lobes on a hypanthium
- C(3-)5(-10)ricate, often large, rarely absent
- A(1, 5-)20 to manyets of 5 or 10 that develop centripetally, filaments usually free and
inserted on hypanthium.
- Inner surface of hypanthium often nectariferous
- G1-many in Maloideae developing into a hypanthial (inferior) ovary