OBE Seminar today 12:10 Skaggs 117 Eric Aschehoug (PhD Defense)

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Presentation transcript:

OBE Seminar today 12:10 Skaggs 117 Eric Aschehoug (PhD Defense) “Indirect Interactions and Plant Community Structure”

Christina McBane & Hilary Bland Blue Mountain

 More Asteridae - big families! Asteraceae Apiaceae

 Apiaceae - Carrot family Inflorescence umbel (often compound)

 Apiaceae - Carrot family Special Fruit type schizocarp = 2 fused achenes

 Lomatium - Biscuitroot - herbs w/ ferny leaves common in rocky grasslands flowers often yellow taproot edible (with processing)

 Asteraceae - Aster or Composite family Alternate name: Compositae Distribution worldwide, primarily temperate zone extremely diverse: 1500 genera, >23,000 species

 Asteraceae - Aster or Composite family Inflorescence = a head with involucral bracts Each “flower” is an inflorescence

 Asteraceae - Aster or Composite family Inflorescence = a head with involucral bracts

 Asteraceae - Aster or Composite family 2 kinds of flowers in composite heads -- disk flowers (radially symmetric, in center) -- ray flowers (irregular, often sterile) Involucral bracts Inflorescence receptacle

 Asteraceae - Aster or Composite family

 Asteraceae - Aster or Composite family Inflorescence receptacle

 Asteraceae - Aster or Composite family Inflorescence receptacle

 Asteraceae - Aster or Composite family 3 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 family Fruit type = achene often with pappus (calyx) modified for wind dispersal

 Asteraceae - Aster or Composite family In Montana largest family: 80 genera, 374 species mostly herbs, some shrubs (ex. Artemisia or Sagebrush) several Noxious Weeds (ex. Centaurea or Knapweed)

 Asteraceae - Aster or Composite family Leaves alternate or opposite entire, toothed or pinnately lobed sometimes 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)

Lamiaceae Boraginaceae Scrophulariaceae

Solanaceae Phlox Dodecatheon Campanula

 More Asteridae - big families! Asteraceae Apiaceae

Exam 2 grade distribution Mean = 80 Median = 81

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