Flora of North America species comparison

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Hemerocallis lilioasphodelus

lemon daylily, yellow day-lily
Habit Plants 5–10 dm; roots enlarged, fibrous.
Leaf

blade dark green, 5–6.5 dm × 0.8–1.5 cm.
Scape

closely branched distally, 8–12-flowered, taller than foliage.
Flowers

often remaining open into night, fragrance strongly sweet, lemony;

perianth tube shortly funnelform, 1.5–2.5 cm;

tepals uniformly pale to bright lemon yellow, veins parallel;

outer tepals 5–7 × 1–1.3 cm, margins smooth;

inner tepals 5–7.5 × 1–2 cm, margins smooth;

filaments 3–3.5 cm;

anthers 2–3 mm;

ovary 5–6 mm;

style white to yellow, 7–8 cm;

pedicel 2–4 mm.
Capsules

fully developed, oblong-elliptic, (2–)3–4 × (1–)1.5–2 cm.
Seeds

black, round or angular by compression, 3–5 mm, shiny.
2n

= 22.

Hemerocallis lilioasphodelus
Phenology Flowering summer.
Habitat Roadsides, waste places, open woods
Elevation 0–500 m [0–1600 ft]
Distribution
from FNA
AR; CT; IL; IN; KY; MA; MD; ME; MI; MN; MS; NC; NJ; NY; OH; OK; PA; RI; TX; VA; VT; WI; WV; NB; ON; QC; e Asia; naturalized Europe [Introduced in North America]
[BONAP county map]
Discussion

Hemerocallis lilioasphodelus was an early introduction to Europe, where it naturalized, and then to North America (W. J. Dress 1955; Hu S. Y. 1968; W. B. Zomlefer 1998). This diploid species escapes only sporadically, unlike the more aggressive H. fulva, with true naturalization frequently questioned (W. B. Zomlefer 1998).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 26, p. 220.
Parent taxa Liliaceae > Hemerocallis
Sibling taxa
H. fulva
Synonyms H. flava
Name authority Linnaeus: Sp. Pl. 1: 324. (1753)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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