Flora of North America species comparison

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Eremogone kingii

Eremogone congesta

King's sandwort

ball-head sandwort, capitate sandwort
Habit Plants tufted or sometimes in compact cushion, green, not glaucous, woody or not at base. Plants tufted or sometimes matted, green, not glaucous, with woody base.
Stems

erect, (1–)3–20(–25) cm, stipitate-glandular or glabrous proximally.

± erect, 3–40(–50) cm, glabrous or often stipitate-glandular.
Leaves

basal leaves abundant, persistent;

cauline leaves in (1–)4+ pairs, reduced distally or not;

basal blades erect or closely ascending to somewhat spreading, green to gray-green, filiform to needlelike or narrowly subulate, 0.3–3(–4) cm × 0.3–1.2 mm, flexuous or rigid, herbaceous, apex apiculate or stiff and spinose, glabrous to stipitate-glandular, not glaucous.

basal leaves persistent or not;

cauline leaves in 3–5 pairs, similar, but reduced distally;

basal blades erect-ascending to arcuate-spreading, subulate or needlelike to filiform, (0.8–)2–11(–14) cm × 0.4–2 mm, flexuous or rigid, herbaceous to ± fleshy, apex obtuse to sharply acute or spinose, glabrous, sometimes glaucous.
Inflorescences

(1–)3–13-flowered, ± open cymes.

3–50+-flowered, congested and capitate or sometimes open, umbellate cymes.
Pedicels

2–15 mm, glabrous to densely stipitate-glandular.

0.1–7(–15) mm or ± absent, usually glabrous, rarely stipitate-glandular.
Flowers

sepals 1–3-veined, lateral veins less developed, ovate or lanceolate, (2.5–)2.8–5(–6) mm, not expanding in fruit, margins broad, apex obtuse to broadly acute or acuminate, glabrous or stipitate-glandular on herbaceous portion;

petals white or rarely pink, oblong to spatulate, (3–)4–7 mm, ca. 1.2–1.3 times as long as sepals, apex entire, erose, or 2-fid almost to base;

nectaries as abaxial, rounded lobe with transverse groove or elongate cup at base of filaments opposite sepals, 0.6 × 0.3 mm.

sepals 1–3-veined, sometimes obscurely so, ovate to lanceolate, 3–6.5 mm, not expanding in fruit, margins narrow, apex obtuse or acute to acuminate, rarely spinose, glabrous (or glandular in var. prolifera);

petals white, oblong, 5–8(–10) mm, 1.5–2 times as long as sepals, apex entire to slightly emarginate;

nectaries as lateral and abaxial mound with crescent-shaped groove at base of filaments opposite sepals, 0.3 × 0.15–0.2 mm.
Capsules

4.5–7 mm, glabrous.

3.5–6 mm, glabrous.
Seeds

black to brown, spheric or oblong to ovoid, 1.2–2.1 mm, low-tuberculate, sometimes papillate on abaxial ridge.

reddish brown to black, broadly ellipsoid to ovoid, 1.4–3 mm, tuberculate;

tubercles low, rounded, often elongate.

Eremogone kingii

Eremogone congesta
Distribution
from FNA
CA; ID; NV; OR; UT
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; SK
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

M. F. Baad (1969) considered Eremogone kingii to be monophyletic despite considerable morphological variation; J. C. Hickman (1971) thought otherwise, considering E. kingii to be a “genetic dumping ground for all the closely related taxa,” but did not propose any new taxonomic alignment.

Eremogone kingii is extremely variable throughout its range with six infraspecific taxa recognized (under Arenaria kingii) by B. Maguire (1947, 1951). We have been unsuccessful in distinguishing more than two of those taxa. The others intergrade to such an extent that formal recognition is unwarranted. Most distinctive of these here-rejected taxa is var. uintahensis, said to have sepals (4.5–)5–6 mm, versus 3.6–4.5(–5) for the other taxa. Interestingly, the type specimen has sepals mostly 4.5 mm long. In the main portion of the range of var. uintahensis, the sepals are rounded to broadly obtuse, but they may also be acute. Furthermore, the sepals and pedicels are often glabrous, but the correlation of the above-mentioned characters varies over the range.

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

Varieties 9 (9 in the flora).

Eremogone congesta is highly polymorphic; it has been been divided into 11 varieties (nine recognized here), most of which are distinctive and locally distributed. M. F. Baad (1969) noted two patterns of variation of different origin within E. congesta, but he did not present a revised classification.

While most specimens of the four varieties with dense inflorescences do not exhibit evident pedicels, the occasional plant does bear one or more pedicels to 1–2 mm, sometimes in secondary inflorescences.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Parent taxa Caryophyllaceae > subfam. Alsinoideae > Eremogone Caryophyllaceae > subfam. Alsinoideae > Eremogone
Sibling taxa
E. aberrans, E. aculeata, E. capillaris, E. congesta, E. eastwoodiae, E. fendleri, E. ferrisiae, E. franklinii, E. hookeri, E. macradenia, E. pumicola, E. stenomeres, E. ursina
E. aberrans, E. aculeata, E. capillaris, E. eastwoodiae, E. fendleri, E. ferrisiae, E. franklinii, E. hookeri, E. kingii, E. macradenia, E. pumicola, E. stenomeres, E. ursina
Subordinate taxa
E. kingii var. glabrescens, E. kingii var. kingii
E. congesta var. cephaloidea, E. congesta var. charlestonensis, E. congesta var. congesta, E. congesta var. crassula, E. congesta var. lithophila, E. congesta var. prolifera, E. congesta var. simulans, E. congesta var. subcongesta, E. congesta var. suffrutescens
Key
1. Petals white, apex 2-fid
var. kingii
1. Petals white or rarely pink, apex entire or erose
var. glabrescens
1. Pedicels usually 0.1-0.2 mm or ± absent; inflorescences dense, tight cymes
→ 2
1. Pedicels 1-6(-15) mm; inflorescences somewhat to markedly open cymes or umbellate cymes
→ 5
2. Basal leaf blades filiform, 3-14 cm
→ 3
2. Basal leaf blades needlelike, 1-3.5 cm
→ 4
3. Inflorescences capitate, rounded cymes; sepal apices obtuse to rounded
var. congesta
3. Inflorescences capitate, pyramidal cymes; sepal apices narrowly acute to acuminate
var. cephaloidea
4. Sepals 5-6.5 mm, apex acute to acuminate; basal leaf blades herbaceous; California, Nevada
var. simulans
4. Sepals 3.5-4 mm, apex obtuse; basal leaf blades ± succulent; California, Oregon
var. crassula
5. Sepal apices obtuse
→ 6
5. Sepal apices acute to acuminate or spinose
→ 7
6. Inflorescences proliferating, ± loose cymes; bracts often not closely enveloping sepals; Alberta, Saskatchewan, Colorado, Idaho, Montana, Utah, Wyoming
var. lithophila
6. Inflorescences umbels, bracts clustered at umbel base; California
var. suffrutescens
7. Basal leaf blades (2-)3-8 cm, filiform; pedicels glabrous or sometimes stipitate-glandular (possible throughout range, true for Nevada populations); Idaho, Nevada, Oregon, Washington
var. prolifera
7. Basal leaf blades 0.5-2.5(-3.5) cm, needlelike or filiform; pedicels glabrous; California, Nevada, Utah
→ 8
8. Inflorescences proliferating, ± loose cymes; sepals 3.5-4.5 mm
var. subcongesta
8. Inflorescences capitate and often rounded, to subcongested, proliferating or open cymes; sepals 4.5-6.5 mm
→ 9
9. Sepals 4.5-5.5 mm, weakly to conspicuously 1-3-veined, apex spinose
var. charlestonensis
9. Sepals usually 5.5-6.5 mm, conspicuously 3-veined, apex acute to acuminate
var. simulans
Synonyms Stellaria kingii, Arenaria kingii Arenaria congesta
Name authority (S. Watson) Ikonnikov: Novosti Syst. Vyssh. Rast. 10: 140. (1973) (Nuttall) Ikonnikov: Novosti Syst. Vyssh. Rast. 10: 139. (1973)
Source FNA vol. 5, p. 67. Treatment authors: Ronald L. Hartman, Richard K. Rabeler, Frederick H. Utech. FNA vol. 5, p. 60. Treatment authors: Ronald L. Hartman, Richard K. Rabeler, Frederick H. Utech.
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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