Habit: Annual, perennial herb, +- fleshy, from taproot or fibrous roots, glabrous.
Stem: 1--several, generally spreading to ascending.
Leaf: basal or basal and cauline, simple, oblanceolate to spoon-shaped; basal rosetted.
Inflorescence: raceme, panicle, or umbel, scapose, bracts generally < sepals, leaf-like or not; flowers generally on 1 side of axis, persistent in fruit or not; pedicels appearing jointed at base with a transverse groove or constriction or not.
Flower: sepals 2, ovate to reniform, generally scarious or scarious-margined, persistent in fruit; petals 2--4, < sepals, tips adherent, forming cap in fruit (fruit cap), falling as 1 unit; stamens 1--3, anthers pink, rose, or yellow; style included to exserted, stigmas 2.
Fruit: 2-valved, generally compressed, narrowly oblong to +- round, generally translucent, deciduous or not.
Seed: 1--many, black, dull, with fine to coarse papillae, to shiny, with papillae 0.
Species In Genus: 9 species: western North America.
Etymology: (Greek: cap, for petal tips in fruit)
Note: Calyptridium parryi var.
arizonicum raised to species rank, as
Calyptridium arizonicum, by Simpson et al. (2010) based on morphological and geographic distinctions.
Jepson eFlora Author: C. Matt Guilliams & John M. Miller
Reference: Hershkovitz 2006 Gayana Bot 63:13--74; Simpson et al. 2010 Madroño: 57:145--160
Unabridged Reference: Hershkovitz 1990 Phytologia 68:267--270; Hershkovitz 1991a Ann Missouri Bot Gard 78:1009--1021; Hershkovitz 1991b Phytologia 70:209--225; Hershkovitz 1992 Syst Bot 17:220--238; Hershkovitz & Zimmer 2000 Molec Phylogen Evol 15:419--439; Hinton 1975 Brittonia 27:197--208; Howell 1945 Leafl W Bot 4:214--216; Kelley et al. 2003 FNANM: 4:460--464; Thomas 1956 Leafl W Bot 8:9--11Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)Key to Calyptridium
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