Chp 8 Evolution and Classifiacation of Eudicots

Worlds largest taxon of plants?
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Terms in this set (18)
Worlds largest taxon of plants?
Eudicots
What percent of eudicots are angiosperms?
75 percent
How many species of eudicot are there?
190000
What is one of the most recent families of eudicots?
Asteraceae
What kind of group are eudicots in?
Monophyletic
Apormorphy of eudicots
tricolpate
or tricolpate-derived pollen grain
Description of the apormorphy from eudicots
3 equally spaced apertures, parallel to polar axis of pollen grain
2. site of exit for pollen tube
3. evolved from monosulcate type
Many eudicots have >3
C.apertures &
diff. aperture positions.
Habits of Asteraceae
Forbs,trees, and shrubs
Flowers characteristics of Asteraceae
densely aggregated into heads surrounded by an involucre of bracts (phyllaries); flat to conical compound receptacle
Inflouresecne of AsteraceaeCompoundSepal characteristics of Asteraceaeare highly modified, forming a pappus of 2-to-many, persistent scales, awns, or bristles that are capillary, hairy, minutely barbed, or plumose, or altogether lacking.Asteraceae heads haveactinomorphic disk flowers only, or 2. ray flowers (ligulate & bilateral) only, or 3. disk flowers in center and ray flowers on the outside.Fruit characteristics of Asteraceaeachene, crowned by a pappusAsteraceae is the _____ largest family worldwide and the largest in NA2ndExample of Asteraceae speciesAster, Eupatorium, Helianthus (sunflower), Solidago (goldenrod)How many genera and spp are in Asteraceae1528 genera/22,750 sppEconomics from Asteraceaefood (e.g., endive, chicory, artichoke, dandelion greens, lettuce); spice plants (e.g., endive), ornamentals; cause of hay fever