Upper Inflorescence Cross Section
Centre Block, Cypress Hills Interprovincial Park
The inflorescence has been cut off near the top. The upper portion has been discarded and the viewer is looking down at the top face of the lower portion.
The inflorescence is composed of pairs of opposite cymes (verticillasters). The lower cymes are often pedunculate. The upper cymes are essentially sessile, as can be seen in this photo. Note that some authors use verticillaster to denote an entire inflorescence consisting of a spike of opposite cymes.
Note the key to the species in Budd's Flora requires stems erect or nearly so; NOT [plants decumbent to ascending]. In fact, the stems of this species can be erect, ascending, or decumbent. The rest of the answers to the key questions appear below.
Procerus: Answers to key questions in Budd's Flora (BF) and Flora of Alberta (FOA) leading to this species.
Penstemon: Answers to key questions in Budd's Flora (BF) and Flora of Alberta (FOA) leading to this genus.
Scrophulariaceae: Answers to key questions in Budd's Flora leading to this family.