Diapensia

Linnaeus

Sp. Pl. 1: 141. 1753.

,

Gen. Pl. ed. 5, 69. 1754 ,.

Common names: Pincushion plant
Etymology: Greek dia-, composed, and pente, five, alluding to sepal, petal, and stamen numbers
Treatment appears in FNA Volume 8. Treatment on page 337. Mentioned on page 332, 333.
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 TaxonIllustrator 
FNA8 P39 Shortia galacifolia.jpegShortia
Shortia galacifolia
Shortia galacifolia var. galacifolia
Pyxidanthera
Pyxidanthera barbulata
Diapensia
Diapensia lapponica
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Subshrubs, forming tussocks, cushions, domes, or mats, caulescent, taprooted. Stems mostly prostrate to decumbent, branched; branches procumbent or decumbent to erect. Leaves cauline, mostly opposite or compactly whorled, densely imbricate or crowded, 3–15 mm; petiole present or absent; blade oblong-lanceolate to narrowly spatulate, obovate, or spatulate-elliptic, slightly falcate, margins entire, apex acute or obtuse, surfaces glabrous, appearing 1-veined, sometimes with 1–2, indistinct, lateral-veins. Inflorescences solitary flowers, pedicellate to subsessile, immediately subtended by 2–3 bracts. Pedicels ebracteate, elongating after anthesis. Flowers: sepals distinct or connate proximally; petals connate in proximal 1/2, corolla cupulate to campanulate, 7–10 mm, lobes white to cream or pinkish tinged to rose, margins entire; anthers 2-locular, without basal spurs, longitudinally dehiscent; filaments adnate to corolla-tube; staminodes absent or vestigial. x = 6.

Distribution

North America, n Europe, Asia

Discussion

Species 5 (2 in the flora).

The three temperate species of Diapensia are endemic to the Sino-Himalayan Mountains. They differ as a group from the two boreal species by their production of vestigial staminodes (see F. Ludlow 1976).

Selected References

None.

Key

1 Plants forming tussocks; branches not adventitiously rooted; leaf blades oblong-oblanceolate to narrowly spatulate, 7-15 × 1.3-2.3 mm, margins with narrow hyaline flange proximally. Diapensia lapponica
1 Plants usually forming mats or low mounds or cushions; branches adventitiously rooted; leaf blades obovate to spatulate-elliptic, 3-8(-12) × 1.5-2.2(-3) mm, margins sometimes with narrow hyaline flange. Diapensia obovata

"elongating" is not a number.

... more about "Diapensia"
obtuse;acute +
Guy L. Nesom +
Linnaeus +
dentate-serrate +  and entire +
falcate;oblong-lanceolate;narrowly spatulate obovate or spatulate-elliptic +
decumbent to erect +  and procumbent +
Pincushion plant +
cupulate +  and campanulate +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
North America +, n Europe +  and Asia +
straight;curved +
Greek dia-, composed, and pente, five, alluding to sepal, petal, and stamen numbers +
loculicidal +
pedicellate +  and subsessile +
crowded +, imbricate +, whorled +  and opposite +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
white +  and cream or pinkish tinged +
tenuinucellate +, bitegmic +  and hemitropous +
amphitropous +, campylotropous +  and anatropous +
Sp. Pl. +  and Gen. Pl. ed. +
cylindric +
connate +  and distinct +
epipetalous +  and antisepalous +
spatulate +  and scale-like +
mostly prostrate +  and decumbent +
slightly 3-lobed;unlobed +
Diapensia +
Diapensiaceae +
taprooted +  and caulescent +
evergreen +  and perennial +