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Calochortus monophyllus
YELLOW STAR-TULIP

Higher Taxonomy
Family: LiliaceaeView DescriptionDichotomous Key

Common Name: LILY FAMILY
Habit: Perennial herb from membranous bulb or scaly rhizome. Stem: underground or erect, branched or not. Leaf: basal or cauline, alternate, subopposite, or whorled. Inflorescence: raceme, panicle, +- umbel-like or not. Flower: perianth parts 6 in 2 generally petal-like whorls, often showy; stamens 3 or 6, filaments free or +- fused to perianth, anthers attached at base or near middle; ovary superior or +- so, style 1, entire or 3-lobed. Fruit: capsule or berry. Seed: 3--many, flat or angled, brown to black.
Genera In Family: 16 genera, 635 species: northern temperate. Note: Users strongly encouraged to protect plants by working around need to see underground parts in using keys, e.g., by trying both leads in couplets solely dependent on such characters. Muscari botryoides (L.) Mill. an historical waif in California. Other TJM (1993) taxa moved to Agavaceae (Agave, Camassia, Chlorogalum, Hastingsia, Hesperocallis, Hesperoyucca, Leucocrinum, Yucca), Alliaceae (Allium, Ipheion, Nothoscordum), Amaryllidaceae (Amaryllis, Narcissus, Pancratium), Asparagaceae (Asparagus), Asphodelaceae (Aloe, Asphodelus, Kniphofia), Melanthiaceae (Pseudotrillium, Stenanthium, Toxicoscordion, Trillium, Veratrum, Xerophyllum), Nartheciaceae (Narthecium), Ruscaceae (Maianthemum, Nolina), Smilacaceae (Smilax), Tecophilaeaceae (Odontostomum), Themidaceae (Androstephium, Bloomeria, Brodiaea, Dichelostemma, Muilla, Triteleia), and Tofieldiaceae (Triantha). North American species of Disporum now in Prosartes.
eFlora Treatment Author: Dale W. McNeal, except as noted
Scientific Editor: Dale W. McNeal, Thomas J. Rosatti.
Genus: CalochortusView DescriptionDichotomous Key

Habit: Bulb coat generally membranous, occasionally fibrous. Stem: scapose or leafy, generally erect, generally branched, bulblets in axils of lower leaves or 0. Leaf: generally linear to lanceolate; basal leaf 1, persistent or not; cauline leaves 0--several, occasionally appearing basal, generally smaller upward, withering or not. Inflorescence: often +- umbel-like; flowers 2--many; bracts 0--several, generally opposite, often paired. Flower: perianth +- closed, spheric to oblong, or open, bell-shaped or +- rotate; sepals generally < petals, generally +- lanceolate (ovate), generally +- glabrous; petals generally widely wedge-shaped, occasionally clawed, generally hairy adaxially, nectary near base; stamens 6, filaments +- flat, often dilated at base, anthers generally attached at base or appearing so; style 1, stigmas 3. Fruit: capsule, septicidal; oblong or linear, generally 3-angled or -winged, chambers 3. Seed: many in 2 rows per chamber, flat, generally +- tan or +- yellow, translucent, or irregular dark brown, often net-like.
Species In Genus: +- 67 species: western North America, Central America; many cultivated. Etymology: (Greek: beautiful grass) Note: Bulbs of some eaten by Native Americans. Many taxa variable, difficult to key.
eFlora Treatment Author: Peggy L. Fiedler

Calochortus monophyllus (Lindl.) Lem.
NATIVE
Stem: 8--20 cm, simple or branched, slender, wavy. Leaf: basal 10--30 cm, persistent; cauline 0--3, 1--7 cm, lanceolate to linear, reduced upward. Inflorescence: flowers 1--6, +- erect; bracts >= 2, paired, 2--6 cm, lanceolate to linear. Flower: perianth bell-shaped; sepals 16--20 mm, ovate to obovate, green-yellow; petals +- = sepals, narrowly obovate, deep yellow, often red-brown-spotted above base, brown-clawed at base, ciliate, densely branched-hairy, nectary crescent-shaped, bordered below by ciliate membrane, above by short, yellow, club-shaped hairs; filaments 4--5 mm, dilated at base, anthers 3--4 mm, pointed, yellow. Fruit: nodding, 12--20 mm, widely elliptic, winged. Seed: irregular, dark brown, net-like. Chromosomes: 2n=20.
Ecology: Wooded slopes, clay-loam soils; Elevation: 400--1200 m. Bioregional Distribution: CaRF, sw CaRH, n&c SN; Distribution Outside California: to southern Oregon. Flowering Time: Apr--May Note: Hybridizes with Calochortus albus.
eFlora Treatment Author: Peggy L. Fiedler
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Citation for this treatment: Peggy L. Fiedler 2016. Calochortus monophyllus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=16744, accessed on September 28, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on September 28, 2016.


Calochortus monophyllus
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© 2002 George W. Hartwell
Calochortus monophyllus
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© 2006 Steve Matson
Calochortus monophyllus
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© 2016 Steve Matson
Calochortus monophyllus
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© 2016 Steve Matson
Calochortus monophyllus
click for enlargement
© 2006 Steve Matson
Calochortus monophyllus
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© 2007 California Academy of Sciences

More photos of Calochortus monophyllus in CalPhotos


Geographic subdivisions for Calochortus monophyllus:
CaRF, sw CaRH, n&c SN;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.