1. Inflorescences on peduncles arising from branches of the previous year; shrub usually over 1 m tall; known only from Keweenaw Co.
1. Inflorescences on peduncles or branchlets of the current year; shrub less than 1 m tall; widespread.
2. Inflorescences axillary, on peduncles from the upper (2–) 3–7 (–10) nodes (of well developed shoots); widest leaf blades 2.1–5 (–6) cm broad.
2. Inflorescences terminal on leafy branches, occasionally with 1–4 additional lateral peduncles present on robust plants; principal leaf blades 1–2.2 (–2.5 or very rarely 3.5) cm broad.
All species found in Ceanothus
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. August 17, 2019. https://michiganflora.net/genus.aspx?id=Ceanothus.