- Group 1Lycophytes, Monilophytes
- Group 2Gymnosperms
- Group 3Monocots
- Group 4Woody angiosperms with opposite or whorled leaves
- Group 5Woody angiosperms with alternate leaves
- Group 6Herbaceous angiosperms with inferior ovaries
- Group 7Herbaceous angiosperms with superior ovaries and zygomorphic flowers
- Group 8Herbaceous angiosperms with superior ovaries, actinomorphic flowers, and 2 or more distinct carpels
- Group 9Herbaceous angiosperms with superior ovaries, actinomorphic flowers, connate petals, and a solitary carpel or 2 or more connate carpels
- Group 10Herbaceous angiosperms with superior ovaries, actinomorphic flowers, distinct petals or the petals lacking, and 2 or more connate carpels
The name Spiraea salicifolia L. was at one time used for our species of western New England now called S. alba var. alba (e.g., Wiegand 1900). Recent reports of S. salicifolia in New England (e.g., Magee and Ahles 1999) are erroneous, as they were based on older publications that were referring to S. alba var. alba.
1a. Inflorescence a simple umbel or corymb, terminating a short-shoot [Fig. 873]
2b. Inflorescences sessile, with 3–7 flowers [Fig. 873]; petioles 1–4 mm long; follicles glabrous or sometimes pubescent along the adaxial suture in S. prunifolia
1b. Inflorescence a panicle or compound corymb (i.e., with branches), terminating a long-shoot [Fig. 872]
4b. Inflorescence a panicle, mostly wider than tall (except in high-elevation plants) [Fig. 872]; leaf blades 3–7 (–8) cm long
Show photos of: Each photo represents one species in this genus.