2. Thesium hookeri Hendrych in Acta Horti Bot. Pragensis. 109. 1962.
YASIN J. NASIR
Perennial 15-33 (-60) cm tall, stoloniferous. Stem erect-ascending or decumbent, usually branched, ± slender. Middle cauline leaves (20-) 30-55 x 2-4 mm, oblong-linear to linear-lanceolate, 1-3-nerved. Peduncle (7-)10-20 mm long, obliquely erect, 1-flowered. Bract leaf-like, 1-3-nerved; bracteoles smaller, 4-7 mm long, linear, equalling or exceeding the flower. Flowers campanulate or broadly so, 3.5-5 mm long, white, 1/3rd lid; lobes triangular-ovate, involute. Nut 2.5-3. 0 mm long, c. 2-2½ times the dried perianth length, ellipsoid to sub-globose, nerves reticulate.
The species closely resembles Thesium himalense, but can be readily distinguished by its broader flowers and leaves and the larger bracts. A polymorphic species, which in the present treatment includes plants that are more compact and with well developed stolons (i.e. Thesium jarmilae Hendrych) or with a loose habit and linear to linear-lanceolate leaves (i.e. Thesium afghanicum Hendrych). Represented in Pakistan by 2 varieties.
