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Calochortus howellii

Howell's mariposa lily

Gunnison's mariposa lily

Habit Plants usually bulbose; bulb coat, when present, membranous.
Stems

slender, not branching or rarely branching in axil of cauline leaf, straight, 2–4 dm.

not branching, straight, 2.4–5.5 dm.

Leaves

basal persistent, 20–35 cm;

blade gradually tapering distally, adaxially pubescent.

basal withering, 18–35 cm;

blade linear.

Inflorescences

subumbellate, 1–3-flowered;

bracts 2, subopposite, linear to narrowly lanceolate, attenuate, 1–3 cm.

subumbellate, 1–3-flowered.

Flowers

erect;

perianth open, campanulate;

sepals shorter than petals, ovate-acuminate, glabrous;

petals yellowish white, with purplish hairs toward base, broadly obovate, cuneate, inconspicuously fringed laterally, sparingly short-hairy adaxially, apex rounded;

glands transversely oblong, slightly depressed, densely covered with short, distally branching hairs, the bases of which unite at lower margin to form inconspicuous, discontinuous membranes;

filaments shorter than anthers;

anthers oblong-lanceolate, apex acute to short-apiculate.

erect;

perianth open, campanulate;

sepals marked similar to petals, lanceolate, usually much shorter, glabrous, apex acute;

petals white to purple, greenish adaxially, clawed, often with narrow, transverse purple band distal to gland and purple blotch on claw, obovate, cuneate, usually obtuse and rounded distally;

glands transversely oblong, not depressed, densely bearded with distally branching hairs, outermost of which somewhat connate at base to form discontinuous, deeply fringed membranes;

filaments shorter than anthers;

anthers lanceolate, apex acute to apiculate.

Capsules

erect, 3-winged, ellipsoid, ca. 2 cm, base and apex acute.

erect, linear-oblong, 3-angled, 3–6 cm, apex acute.

Seeds

light-colored, irregular.

flat, inflated.

2n

= 20.

= 18.

Calochortus howellii

Calochortus gunnisonii

Phenology Flowering late spring–mid summer.
Habitat Dry, rocky, serpentine soils
Elevation 300–500 m (1000–1600 ft)
Distribution
from FNA
OR
[WildflowerSearch map]
[BONAP county map]
from USDA
wc North America
[WildflowerSearch map]
[BONAP county map]
Discussion

Calochortus howellii is known only from the Illinois River valley, Josephine County.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Petals white to purple, occasionally yellow; w United States.
var. gunnisonii
1. Petals pale yellow; New Mexico only.
var. perpulcher
Source FNA vol. 26, p. 129. FNA vol. 26, p. 140.
Parent taxa Liliaceae > Calochortus Liliaceae > Calochortus
Sibling taxa
C. albus, C. amabilis, C. ambiguus, C. amoenus, C. apiculatus, C. argillosus, C. aureus, C. bruneaunis, C. catalinae, C. clavatus, C. coeruleus, C. concolor, C. coxii, C. dunnii, C. elegans, C. eurycarpus, C. excavatus, C. flexuosus, C. greenei, C. gunnisonii, C. indecorus, C. invenustus, C. kennedyi, C. leichtlinii, C. longebarbatus, C. luteus, C. lyallii, C. macrocarpus, C. minimus, C. monanthus, C. monophyllus, C. nitidus, C. nudus, C. nuttallii, C. obispoensis, C. palmeri, C. panamintensis, C. persistens, C. plummerae, C. pulchellus, C. raichei, C. simulans, C. splendens, C. striatus, C. subalpinus, C. superbus, C. tiburonensis, C. tolmiei, C. umbellatus, C. umpquaensis, C. uniflorus, C. venustus, C. vestae, C. weedii, C. westonii
C. albus, C. amabilis, C. ambiguus, C. amoenus, C. apiculatus, C. argillosus, C. aureus, C. bruneaunis, C. catalinae, C. clavatus, C. coeruleus, C. concolor, C. coxii, C. dunnii, C. elegans, C. eurycarpus, C. excavatus, C. flexuosus, C. greenei, C. howellii, C. indecorus, C. invenustus, C. kennedyi, C. leichtlinii, C. longebarbatus, C. luteus, C. lyallii, C. macrocarpus, C. minimus, C. monanthus, C. monophyllus, C. nitidus, C. nudus, C. nuttallii, C. obispoensis, C. palmeri, C. panamintensis, C. persistens, C. plummerae, C. pulchellus, C. raichei, C. simulans, C. splendens, C. striatus, C. subalpinus, C. superbus, C. tiburonensis, C. tolmiei, C. umbellatus, C. umpquaensis, C. uniflorus, C. venustus, C. vestae, C. weedii, C. westonii
Subordinate taxa
C. gunnisonii var. gunnisonii, C. gunnisonii var. perpulcher
Name authority S. Watson: Proc. Amer. Acad. Arts 23: 266. (1888) S. Watson: Botany (Fortieth Parallel), 348. (1871)
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