The genus name comes from the Greek stacys, meaning ear of corn, in probable reference to the verticillaster arrangement of flowers.
The flowers are arranged in verticillasters (false whorls).
We quantified: 1) the number of infructescences per plant; 2) numbers of verticillasters per infructescence, capsules per verticillaster, and mature and aborted seeds per capsule, 3) seed weight; 4) seed viability; and, 5) seed production in relation to infructescence stem height.
The mean number of total capsules per verticillaster (6.1, SE = 0.21, N= 441) also was not different among treatments across years.
However, the three spray treatments did not increase parameters of seed reproduction, relative to the control treatment: mature capsules per verticillaster (Fig.
Our measurements taken from the pair of leaves just below the first fruit bearing verticillaster avoids the variable of determining the base of the plant.
Further, we found six capsules initiated per verticillaster but only 3.22 capsules maturing to produce seed.
The inflorescence of blowout penstemon is a thyrse characterized by a series of pairs of opposite leafy bracts subtending individual cymes, called verticillasters, of two to eight flowers (Great Plains Flora Association 1986).
The number of verticillasters increased as the length of the infructescence stalk increased (Fig.
The number of verticillasters per infructescence also did not differ significantly among treatments.