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cancer root, ghost pipe, naked broomrape, one-flower broom-rape, one-flower cancer-root, orobanche uniflore, small cancer-root

California broomrape, wing rib

Habit Plants simple or few-branched basally, sometimes forked medially, 3.5–18(–25) cm (including pedicels), stem portion 1–5(–7) cm, slender, base not enlarged. Plants simple or branched proximally, 4–35(–40) cm, slender or stout, base sometimes enlarged.
Roots

inconspicuous, slender or stout, unbranched or few-branched.

inconspicuous (rarely forming a bulbous mass), slender or stout, unbranched, sometimes branched (subsp. grandis).

Leaves

relatively few, loosely imbricate or more remote, loosely ascending to spreading;

blade oblong-lanceolate to awl-shaped, 2–10 mm, margins entire, often inrolled, apex acuminate, surfaces glabrous.

numerous, appressed;

blade broadly ovate, triangular, deltate, lanceolate, or oblong, 4–12 mm, margins entire or erosulate, apex obtuse or rounded, surfaces glabrous.

Inflorescences

of solitary flowers or fascicles of 2(–4) at stem or branch tips, white to cream, sometimes purple tinged, simple, glabrous;

bracts loosely ascending and erect, oblanceolate to broadly ovate, obovate, rhombic, or awl-shaped, 5–12 mm, apex acute to acuminate, glabrous, rarely glandular-pubescent distally.

corymbs (sometimes subcapitate), sometimes racemes or subcorymbose racemes, dark purple, reddish purple, pinkish, or pallid cream to nearly white, simple, sometimes inconspicuously branched, densely glandular-puberulent;

flowers numerous (rarely 10 or fewer in depauperate plants);

bracts appressed to spreading, ± lanceolate to oblanceolate, 5–15 mm, apex acute, glandular-pubescent.

Pedicels

(8–)20–110(–170) mm, much longer than plant axis;

bracteoles 0.

0–20(–25) mm, shorter than plant axis;

bracteoles 2.

Flowers

calyx white to straw colored or light yellow, or pale to dark, dull purple, sometimes brownish, ± radially symmetric, 4–12(–15) mm, divided into 5 subequal lobes, lobes slightly shorter than to 2 times as long as tube, ± triangular or subulate-triangular, sparsely to moderately glandular-pubescent;

corolla (11–)15–30(–35) mm, tube white to purple, blue, or yellow, sometimes lighter proximally or with light or darker purple or blue veins, slightly to moderately constricted above ovary, ± bent forward, glandular-pubescent;

palatal folds ± prominent, bright yellow, glandular- and/or eglandular-pubescent, sometimes glabrescent;

lips white, yellow, purple, or blue, sometimes with light or darker purple or blue veins, abaxial lip slightly to moderately spreading, sometimes ± recurved distally, (1–)2–6(–9) mm, lobes oblong-obovate to nearly round, apex rounded to bluntly pointed or shallowly emarginate (sometimes with 2 notches), adaxial lip slightly to moderately spreading, sometimes recurved, 2–6(–9) mm, lobes broadly oblong-ovate to oblong-semiorbiculate, apex rounded, rarely bluntly pointed or shallowly emarginate;

filaments glabrous, anthers included, glabrous or villous-tomentose.

calyx pallid to dark purple, pink, yellow, or white, ± weakly bilaterally symmetric, 8–20(–27) mm, deeply divided into 5 (sometimes reflexed or contorted) lobes, lobes subulate to linear-subulate, gradually attenuate, glandular-pubescent;

corolla 22–50(–55) mm, tube white or cream to pinkish or purplish tinged or pink to purple, sometimes with darker veins, constricted above ovary, curved forward, sparsely to moderately glandular-puberulent;

palatal folds prominent, yellow, glabrous (lacking blisterlike swellings), sometimes pubescent;

lips white or cream to pinkish or purplish tinged (then sometimes appearing reddish brown in herbarium specimens) or pink to purple, sometimes with darker veins or dark purple distally, abaxial lip widely spreading, 8–15 mm, lobes ± lanceolate to ± oblong, lanceolate-subulate, narrowly triangular, or lanceolate-ovate, apex ± acute to rounded or obtuse, sometimes retuse or emarginate, adaxial lip ± spreading, 10–15(–18) mm, lobes broadly deltate to ovate or oblong, apex bluntly pointed to rounded, obtuse, acute, shallowly retuse, erosulate, emarginate, shallowly notched, or erose;

filaments glabrous, anthers included, densely villous on sutures, rarely glabrous.

Capsules

ovoid to oblong-ovoid, 4–8(–11) mm.

ovoid to cylindric-ovoid, 10–12 mm.

Seeds

0.1–0.4 mm.

0.4–0.6 mm.

Orobanche uniflora

Orobanche californica

Distribution
from FNA
AK; AR; AZ; CA; CO; CT; DC; DE; FL; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; ON; PE; QC; SK; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA; BC; nw Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

Orobanche uniflora forms a polymorphic complex that requires more detailed study. The detection of broad-scale patterns of morphological variation is confounded by the differentiation among local races. D. M. Achey (1933) recognized five varieties, and K. C. Watson (1975), in her unpublished thesis, revised the classification to three subspecies. The present treatment, which accepts only the two major infraspecific variants as subspecies, should be considered highly tentative.

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

Subspecies 6 (6 in the flora).

Plants of Orobanche californica occur almost entirely in and west of the Cascade-Sierra Nevada-Peninsular ranges from British Columbia south to the Sierra San Pedro Mártir in Baja California. Host plants are various perennial members of Asteraceae.

L. R. Heckard (1973) discussed the difficulty of presenting a classification for Orobanche californica based on the few morphological features that must be used for taxonomic delineation and the sometimes baffling disjunctions in the distribution of the variants. He recognized six subspecies based on geographic variations that demonstrate the considerable variability within the species. The following key to subspecies is adapted from the key by Heckard.

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

Key
1. Calyx lobes slightly shorter than to only slightly longer than tubes, narrowly to broadly lanceolate-triangular; corollas white to pale yellow, sometimes pale purplish tinged and/or with light purple veins.
subsp. uniflora
1. Calyx lobes ca. 2 times as long as tubes, subulate-triangular; corollas purple to blue (often with a white throat), yellow, or white, often with darker purple or blue veins.
subsp. occidentalis
1. Corollas dark purple or red-purple distally; calyx lobes and bracts purple tinged, drying blackish purple.
subsp. californica
1. Corollas pallid, pinkish, pale lavender, whitish, or yellowish distally, often with darker veins; calyx lobes pallid, pinkish tinged, whitish, yellow, or buff, sometimes purplish or tinged pinkish, purple, or brownish, bracts pallid to pinkish tinged, drying brown.
→ 2
2. Corolla tubes gradually widening toward throat, corollas pallid or yellow distally, sometimes pinkish tinged.
subsp. feudgei
2. Corolla tubes abruptly widening toward throat, corollas pallid, pale pink, or pale lavender, sometimes yellowish tinged distally.
→ 3
3. Corollas 35–50 mm, abaxial lobes lanceolate to lanceolate-ovate, 5–7 mm wide.
subsp. grandis
3. Corollas 25–35(–40) mm, abaxial lobes lanceolate to lanceolate-subulate, narrowly lanceolate, or lanceolate-oblong to narrowly triangular, 2–4(–5) mm wide.
→ 4
4. Plants (8–)10–35 cm, portions proximal to inflorescences 6–15 cm; inflorescences racemes, sometimes subcorymbose, 5–20 cm.
subsp. jepsonii
4. Plants 4–10(–15) cm, portions proximal to inflorescences 1–8(–12) cm; inflorescences corymbs, sometimes subcorymbose or subcapitate racemes, 2–6 cm.
→ 5
5. Plants: portions proximal to inflorescences 1–3(–4) cm; abaxial corolla lobes lanceolate to lanceolate-subulate, 2–3 mm wide, apices acute.
subsp. grayana
5. Plants: portions proximal to inflorescences 3–8(–12) cm; abaxial corolla lobes lanceolate-oblong to narrowly triangular, 3–4 mm wide, apices bluntly acute or obtuse, sometimes retuse or emarginate.
subsp. condensa
Source FNA vol. 17, p. 472. FNA vol. 17, p. 478.
Parent taxa Orobanchaceae > Orobanche Orobanchaceae > Orobanche
Sibling taxa
O. arizonica, O. bulbosa, O. californica, O. cooperi, O. corymbosa, O. fasciculata, O. ludoviciana, O. minor, O. multiflora, O. parishii, O. pinorum, O. ramosa, O. riparia, O. robbinsii, O. valida, O. vallicola
O. arizonica, O. bulbosa, O. cooperi, O. corymbosa, O. fasciculata, O. ludoviciana, O. minor, O. multiflora, O. parishii, O. pinorum, O. ramosa, O. riparia, O. robbinsii, O. uniflora, O. valida, O. vallicola
Subordinate taxa
O. uniflora subsp. occidentalis, O. uniflora subsp. uniflora
O. californica subsp. californica, O. californica subsp. condensa, O. californica subsp. feudgei, O. californica subsp. grandis, O. californica subsp. grayana, O. californica subsp. jepsonii
Synonyms Anoplanthus uniflorus, Aphyllon uniflorum, Thalesia uniflora Aphyllon californicum, Myzorrhiza californica, Phelypaea californica
Name authority Linnaeus: Sp. Pl. 2: 633. (1753) Chamisso & Schlechtendal: Linnaea 3: 134. (1828)
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