Book  (Oct 2001)  Page(s) 101-102.  Includes photo(s).
 
Clematis addisonii
Texensis-Viorna Group
Origin: Southeastern United States
Species 1890
... The tepals, shaped like the head of a lance, can be quite variable in colour through pale shades of reddish purple to bluish purple becoming whitish at the recurving tips. Stamens are creamy... wild plants grow in wooded river banks... Suitable for sun or semi-shade... prone to mildew...

Book  (1901)  Page(s) 182.  
 
Erect Clematis.  Silky Clematis.
Clematis Addisònii, Addison's Brown clematis, a leafy, perennial herb bears terminal and axillary, nodding flowers with a purplish calyx.  Its stem is erect or ascending, from one to three feet high, reddish brown and covered with a bloom.  The lower leaves vary from ovate to lanceolate and clasp the stem with rounded bases.  On their edges they are somewhat wavy.  The upper leaves which are pinnately-divided terminate in a tendril.  From Georgia to Virginia, in rich soil, especially along river banks, the plant prefers to grow.

Book  (1840)  Page(s) 657.  
 
C. ovata. -We have a specimen from Tennessee (collected by Dr. Currey), which proves that this species is at least sometimes climbing, and the lower leaves compound : hence it should probably stand next to C. Viorna.

Book  (1840)  Page(s) 8.  
 

C. ovata (Pursh): stem simple; leaves broadly ovaté, on very short petioles, glabrous, glaucous and reticulately veined beneath, the lower ones subcordate; peduncle terminal, solitary, 1-flowered ; flower inclined. Pursh, fl. 2. p. 736; DC. prodr. 1. p. 8.
Mountains of North Carolina, Le Conte! South Carolina, Pursh. Georgia or Florida, Baldwin! Whole plant glabrous. Flower nearly as large. as in C. ochroleuca, purple? Sepals ovate, acuminate, pubescent on the margin, a little exceeding the stamens.