14 November heavily pubescent shoot	27 October cleistogamous flowers; calex trichomes short
H. reverchonii var. serpyllifolia

by Bob Harms 

Three seasonal (fall—winter) differences have been noted. These are clear in October, but may already be apparent in September:

• Stem & leaf morphology
• Calyx trichome length
• Cleistogamy vs. Chasmogamy in late fall