Key to Arisaema of North America

Arisaema :  key to North American Taxa

 

1a. Leaflets (3-5). Spadix blunt apically, shorter than

       spathe.                                                                    2. A. triphyllum

 

2b.  leaflets 5.                                                                 var. quinatum

 

2b.  leaflets 3.                                                                 3.

 

3a.  Leaves glaucous beneath at maturity. Spathe flange

       4.5 - 9.0 mm wide.  Spathe hood green or green with

       purple stripes. Sterile spadix appendage club-shaped,

      rarely cylindrical. Stomatal guard cell length mostly

      greater than 40 µm                                                   ssp. triphyllum

 

3b.  Leaves polished or lustrous beneath, not glaucous.

        Spathe flange 1-3 mm wide. Sterile spadix

         appendage cylindrical, rarely club-shaped. Stomatal

         guard cell length mostly less than 40 µm.           4.

                                                 

4a.  Spathe tube strongly fluted. Spathe hood green

       with white or purple stripes.                                ssp. stewardsonii

 

4b.  Spathe tube not fluted or rarely weakly fluted.

        Spathe hood green or purple, not striped.   ssp. pusillum

 

1b.  Leaflets (5-) 7-13 (-21). Spadix tapering apically,

        much longer than spathe.                                  4. A. dracontium

 

5a.  Spathe tightly inrolled around the spadix. To 1.5cm

       broad when unfurled.                                             var. dracontium

 

5b. Spathe flared distally, forming a blade, to 2.5cm

       broad.                                                              var. macrospathum

 

 

Based upon:

 

http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=102590

 

Ward, Daniel B. (2012) Keys to the Flora of Florida – 31 Arisaema (Araceae).  Phytologia 94(2) pp. 151 – 158.

Key to Arisaema of North America

$0.00Price