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Dodecatheon conjugens

Bonneville shooting star, desert shootingstar, slim-pod shooting star

western arctic shootingstar

Habit Plants 5–30(–40) cm; scape usually glabrous, sometimes glandular-puberulent proximally. Plants (4–)8–30(–40) cm; scape glandular-puberulent.
Caudices

not obvious at anthesis;

roots whitish;

bulblets absent.

obvious at anthesis, often horizontal and elongated, slender to stout, (often woody);

roots reddish;

bulblets absent.

Leaves

3–13(–18) × 0.7–2.5(–4) cm;

petiole slender (at least proximally);

blade narrowly oblanceolate to spatulate or obovate, base usually not decurrent onto stem, usually abruptly tapering to petiole, margins entire, surfaces glabrous or glandular-puberulent.

(2–)3.5–12(–19) × 0.7–2.5(–4.5) cm;

petiole slightly winged or slender (at least basally);

blade ovate to oval, rarely oblong to spatulate, base slightly to obviously decurrent onto stem, abruptly tapering to petiole, margins subentire to crenate-dentate, surfaces minutely glandular-puberulent or glabrous.

Inflorescences

1–7(–10)-flowered;

bracts lanceolate to broadly lanceolate, 3–10 mm, glandular-puberulent.

2–7-flowered;

bracts narrowly lanceolate, 3–8 mm, glandular-puberulent.

Pedicels

1–5 cm, glabrous or glandular-puberulent.

0.5–2.5(–3) cm, glandular-puberulent.

Flowers

calyx light green to yellowish, sometimes finely purple-speckled or -dotted, 5–12 mm, glabrous or glandular-puberulent, tube 2–6 mm, lobes 5, 3–7 mm;

corolla tube yellowish with purplish red, thin, wavy ring, lobes 5, usually magenta, sometimes white, 7–25(–35) mm;

filaments usually distinct, yellowish or dark maroon, 0.5–1.5 mm, rarely partially connate and tube 0.5–1.5 × 1.5–5 mm;

anthers 5–9 mm;

pollen sacs usually maroon or yellow, sometimes yellowish and speckled maroon, rarely with reddish purple to purple speckles, connective usually maroon, sometimes yellowish or light blue to whitish, transversely rugose;

stigma not enlarged compared to style.

calyx green to dark green, sometimes speckled with reddish purple, 4–7 mm, glandular-puberulent, tube 1.5–3 mm, lobes 5, (2–)2.5–4 mm;

corolla tube yellow or rarely white with or sometimes without maroon, thick, wavy ring, lobes 5, pink or magenta to lavender, rarely white, (5–)8–15(–20) mm;

filaments distinct or slightly connate, maroon, 0.2–0.8 mm;

anthers (3–)4–6 mm;

pollen sacs usually maroon, sometimes pale purple and speckled with maroon, connective black, smooth;

stigma not enlarged compared to style.

Capsules

tan, often striped with purple, usually operculate, rarely valvate, cylindric-ovoid, 8–17(–22) × 4–6(–8) mm, glabrous;

walls thin, pliable.

reddish brown to purplish, operculate, cylindric-ovoid, 6–12 × 3–4.5(–5) mm, glabrous or slightly glandular-puberulent apically;

walls thin, pliable.

Seeds

without membrane along edges.

without membrane along edges.

2n

= 44.

= 44.

Dodecatheon conjugens

Dodecatheon frigidum

Phenology Flowering summer.
Habitat Moist to boggy depressions, flats and rocky, often calcareous slopes, stream banks, lake shores, outcrops and screes mainly in meadows, low dunes, sparse conifer woodland, willow and heath tundra communities near melting snow or on permafrost
Elevation 0-1700(-1900) m (0-5600(-6200) ft)
Distribution
from FNA
CA; ID; MT; NV; OR; WA; WY; AB; BC; SK
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; BC; NT; SK; YT; e Asia (Russian Far East)
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

Both Dodecatheon conjugens and D. poeticum occur in proximity in the Columbia River gorge. Some specimens here assigned to var. conjugens may have scattered, minute glands on the pedicels that might indicate past hybridization with D. poeticum (e.g., G. N. Jones 6286, ORE; R. R. Halse 3790, OSC, WTU). Dodecatheon poeticum is densely glandular not only on the pedicels, but also on the calyx and scape. The type of minute glandular puberulence seen on var. conjugens found along the Columbia River west of The Dalles is somewhat similar to that seen on var. viscidum in western Montana and Canada. Some plants referred here to D. conjugens have slightly connate filaments that may indicate some intergradation with D. pulchellum var. pulchellum. This suggestion is supported by the tendency in the same plants to have narrower leaves.

Some newly emerged flowers tend to have connectives that are less rugose than normal. This is particularly true of some populations in southern Alberta and, to a lesser degree, in Saskatchewan.

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

Dodecatheon frigidum is the northernmost species in the genus. It is found from northern British Columbia, southern Northwest Territories (Mackenzie District), and northwestern Saskatchewan, and Yukon (including its northern islands), and most of Alaska except near the immediate southern coast and Aleutian Islands. The species is disjunct onto the Chukotsk Peninsula in the Russian Far East. The elongated, usually woody, nearly horizontal caudex is diagnostic.

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

Key
1. Leaf blades, scapes, and pedicels glabrous.
var. conjugens
1. Leaf blades, scapes proximally, and pedicels usually glandular-puberulent.
var. viscidum
Source FNA vol. 8, p. 271. FNA vol. 8, p. 277.
Parent taxa Primulaceae > Dodecatheon Primulaceae > Dodecatheon
Sibling taxa
D. alpinum, D. amethystinum, D. austrofrigidum, D. clevelandii, D. dentatum, D. ellisiae, D. frenchii, D. frigidum, D. hendersonii, D. jeffreyi, D. meadia, D. poeticum, D. pulchellum, D. redolens, D. subalpinum, D. utahense
D. alpinum, D. amethystinum, D. austrofrigidum, D. clevelandii, D. conjugens, D. dentatum, D. ellisiae, D. frenchii, D. hendersonii, D. jeffreyi, D. meadia, D. poeticum, D. pulchellum, D. redolens, D. subalpinum, D. utahense
Subordinate taxa
D. conjugens var. conjugens, D. conjugens var. viscidum
Synonyms Primula conjugens Primula frigida
Name authority Greene: Erythea 3: 40. (1895) Chamisso & Schlechtendal: Linnaea 1: 222. (1826)
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