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|Family: Rosaceae||View Description||Dichotomous Key|
|Genus: Poteridium||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Poteridium annuum (Nutt.) Spach
Habit: Annual, biennial, taprooted, nonglandular. Stem: generally ascending to erect, generally 10--70 cm. Leaf: alternate, odd-1-pinnately compound; basal withered at flower; largest cauline generally 3--12 cm; leaflets 4--7 per side, largest blade 5--20 mm, +- sessile, +- obovate-elliptic, lobes < 15, > 2/3 to midvein, linear. Inflorescence: spike, head-like, 5--35 mm, 5--10 mm wide, cylindric-ovoid, +- 10--50-flowered; peduncle 3--15 cm; pedicel bractlets 2, subtended by 1 bract, all 3 2--3 mm wide. Flower: bisexual; hypanthium urn-shaped, bractlets 0; sepals generally 4, 2--3 mm, ovate, green; petals 0; stamens generally 2, filaments thread-like; pistil 1, ovary superior, continuous to style at top, stigma +- bushy, exserted. Fruit: hypanthium enclosing achene, 2--4 mm, 4-angled, +- winged, hard, faces wrinkled. Chromosomes: 2n=14.
Ecology: Open, especially disturbed areas; Elevation: 225--1890 m. Bioregional Distribution: KR, CaRH, n&c SNH, n CCo, PR, MP; Distribution Outside California: to British Columbia, Montana. Flowering Time: Apr--Jul
Synonyms: Sanguisorba annua (Nutt.) Nutt. ex Torr. & A. Gray; Sanguisorba occidentalis Nutt. ex Torr. & A. Gray, inval.
eFlora Treatment Author: Daniel Potter & Barbara Ertter, family description, key to genera; treatment of genera by Daniel Potter
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Citation for this treatment: Daniel Potter & Barbara Ertter, family description, key to genera; treatment of genera by Daniel Potter 2017. Poteridium annuum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=39819, accessed on February 19, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 19, 2017.