[Trillium-l] Sulcatum Diversity

Holmes holmes_harold at bellsouth.net
Sun May 8 02:53:54 CEST 2011


     I was recently blown away with the diversity observed in my Trillium 
sulcatum at HBG. I documented this diversity in a case study. I copied a 
summary of this below. Perhaps Tom Patrick ("Mr. Sulcatum") and others will 
comment on sulcatum diversity.

Harold Holmes Z-7 Where the last trillium has faded and seed production is 
in process.

Trillium Sulcatum 2011 Case Study

Location: Huntsville Botanical Garden.

Date: 11-18 April 2011.

Sample: 42 plants from a population of ~ 200 T. sulcatum at HBG.

Purpose:  Identify diversity in HBG Trillium sulcatum population.

Discussion:  There is much diversity in the Trillium Erectum Complex. Many 
of the features in this diversity extend across the different species. 
Casual observation of the Trillium sulcatum at the HBG sparked interest in 
this diversity.  Seven features were selected to compare this diversity. 
Diversity parameters selected were relative and general and not absolute and 
analytical measurements. All 42 plants selected were documented with 
close-up photography Images to capture the feature variances.  I would 
classify most of the ~160 T. sulcatum plants not chosen as "Classical" 
sulcatum or I was unable to get an acceptable image.

Diversity Features Selected:

1.     Flower Color Forms.

2.     Ovary Color Forms.

3.     Sepal Color Forms.

4.     Sepal Lengths.

5.     Sepal Sulcate Forms.

6.     Flower Petal Shapes.

7.     Flower Petal Forms.

Conclusions and Caveats:  This case study should not be considered a 
scientific study but only a observation survey. Although a few of the plants 
could be classified as other than sulcatum, there is basis for all 
classified as sulcatum. I  was truly amazed at the diversity demonstrated in 
this Trillium Sulcatum 2011 Case Study.

Diversity Feature Data:

1.     Flower Color Forms.

-Maroon           16

-White              6

-Cream             7

-Yellow             6

-Blush              4(1 variable)

-Chocolate       3

2.     Ovary Color Forms.

-Maroon           26

-Black               8

-Pink                8

3.     Sepal Color Forms.

-Green                       23

-Green w/ dark edges 10

-Dark                         6

-Striped                     8

4.     Sepal Lengths.

-Short (<3/4 petal length)   23

-Long (>3/4 Petal length)   19

5.     Sepal Sulcate Forms.

-No Sulcate                7

-Slight Sulcate           21

-Great Sulcate           14

6.     Flower Petal Shapes.

-Acute/pointed           5

-Oblate/rounded        20

-Intermediate             17

7.     Flower Petal Forms.

-Strong Recurved       14

-Slight Recurved        18

-Not Recurved            10


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