BOT 360F - Families of Vascular Plants
ASTERACEAE (Heliantheae) - Bidens cernuus L., Galinsoga parviflora Cav., Helianthus sp., Rudbeckia hirta L., Silphium perfoliatum L., Silphium terebinthinaceum Jacq., and ragweed (Ambrosia spp.)! The ragweed page is especially worth visiting since it makes it easy to understand how this genus can make people so miserable with its airborn pollen (Brian Johnston MICscape article).
Helianthus sp. - Photo: M. P. Ruggles

 

Helianthus L. - sunflower

Photos left and below: © 2006 Michael P. Ruggles

Note pollen grains on bumblebee's back (below, left); smooth-bodied flies (below, right) carry far fewer pollen grains. Also note the different phases exhibited by individual flowers: at the left, the bumble bee is probing among disk flowers that have just exserted their styles or are about to do so; at the right this has long since happened, and the stigmatic branches are fully recurved.

Helianthus sp. with bumblebee - Photo: M. P. Ruggles Helianthus with fly - Photo: M. P. Ruggles

 

Bidens cernuus L. - nodding beggar tick

Photo: 2004 Royal Ontario Museum (TRT 20494)

Click HERE for outstanding close-up images of different beggar tick species (Brian Johnston MICscape article).

           

           
Galinsoga parviflora Cav. (15121 bytes) Galinsoga parviflora Cav. 

Photo: R. Presgrave
1997 Royal Ontario Museum (TRT 3604)

Rudbeckia hirta L. (17869 bytes) Rudbeckia hirta L.  

Photo: R. Presgrave
1997 Royal Ontario Museum (TRT 3652)

Silphium perfoliatum L. - habit (20979 bytes) Silphium perfoliatum L. - The genus Silphium was known in Greece and Rome as an effective contraceptive (Toronto Star 28 August 1994).

Photo: R. Presgrave
1997 Royal Ontario Museum (TRT 3680)

Silphium perfoliatum L. - flowers (20424 bytes) Silphium perfoliatum L. - flowers 

Photo: R. Presgrave
1997 Royal Ontario Museum (TRT 3679)

Silphium perfoliatum L. - fruits (18310 bytes) Silphium perfoliatum L. - fruits 

Photo: R. Presgrave
1997 Royal Ontario Museum (TRT 3681)

Silphium terebinthinaceum Jacq. (prairie-dock) - In Ontario, restricted to islands of tall-grass prairie such as Ojibway Prairie in Windsor, seen here. Plants grow to more than 2m tall.

 

Photo: © 2001 T. A. Dickinson


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Please send your comments to tim.dickinson@utoronto.ca; last updated 25-Oct-2008