OBE Seminar today 12:10 Skaggs 117 Eric Aschehoug (PhD Defense) “Indirect Interactions and Plant...
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Transcript of OBE Seminar today 12:10 Skaggs 117 Eric Aschehoug (PhD Defense) “Indirect Interactions and Plant...
OBE Seminar today12:10 Skaggs 117
Eric Aschehoug (PhD Defense)
“Indirect Interactions and Plant Community Structure”
Lomatium - Biscuitroot - herbs w/ ferny leaves
- common in rocky grasslands
- flowers often yellow
- taproot edible (with processing)
Asteraceae - Aster or Composite familyAlternate name: Compositae
Distributionworldwide, primarily temperate zoneextremely diverse: 1500 genera, >23,000 species
Asteraceae - Aster or Composite family
Each “flower” is an inflorescence
Inflorescence = a head with involucral bracts
Asteraceae - Aster or Composite family2 kinds of flowers in composite heads
-- disk flowers (radially symmetric, in center)-- ray flowers (irregular, often sterile)
Inflorescencereceptacle
Involucralbracts
Asteraceae - Aster or Composite family3 kinds of inflorescences
ray flowers only disk and ray flowers disk flowers only
Not all composites are yellow -- this is just a sample!!
Asteraceae - Aster or Composite familyFruit type = acheneoften with pappus (calyx) modified for wind dispersal
Asteraceae - Aster or Composite familyIn Montana
largest family: 80 genera, 374 speciesmostly herbs, some shrubs (ex. Artemisia or Sagebrush)several Noxious Weeds (ex. Centaurea or Knapweed)
Asteraceae - Aster or Composite familyLeaves
alternate or oppositeentire, toothed or pinnately lobedsometimes prickly (thistles)often a basal rosette in perennial herbs
Aster - Aster - >25 species in Montana
- annual or perennial herbs
- leaves simple, often linear
- disk and ray flowers
Centaurea - Knapweed/Star-thistle - ~5 non-native weeds
- perennial herbs w/ taproot
- leaves simple, lobed, compound
- plants spiny
Artemesia - Sagebrush - 20 species
- dryland shrubs
- leaves simple or lobed; hairy
- plants aromatic
- disk flowers only (not showy)