Diamorpha

Nuttall

Gen. N. Amer. Pl. 1: 293. 1818, name conserved ,.

Common names: Elf orpine
Etymology: Greek diamorphe, contrary or different form, alluding to fruit compared with that of related genera
Treatment appears in FNA Volume 8. Treatment on page 197. Mentioned on page 147, 150, 198.

Herbs, annual, not viviparous, 0.2–1 dm, glabrous. Stems erect, simple or branching, fleshy. Leaves persistent, first crowded in winter rosette atop hypocotyl, remainder cauline, alternate, ± alike, not connate basally; petiole to 7 mm; blade oblong, subterete, 0.2–0.6 cm, succulent, base short-spurred, margins entire; veins not conspicuous. Inflorescences terminal, lax, corymbose cymes (with uniparous branches). Pedicels present. Flowers erect, 4-merous; sepals connate basally, all alike; petals spreading, distinct, white or pinkish; calyx and corolla not circumscissile in fruit; nectaries reniform; stamens 2 times as many as sepals; filaments free; pistils erect, connate 1/3–1/2 their lengths; ovary base rounded; styles 2+ times shorter than ovary. Fruits cruciate capsules, erect, with spreading, centrally connate pistils, dehiscent by abaxial valves. Seeds subglobose-ovoid, finely granulate-striate. x = 9.

Distribution

se United States

Discussion

Species 1: se United States.

Diamorpha is the only member of the family to have valved capsules instead of follicles that open along the ventral suture (rarely utricles), and it is notable also for its subglobose seeds. P. A. Sherwin and R. L. Wilbur (1971) worked out the floral anatomy of Diamorpha and of two species of Sedum sometimes thought related. They found Diamorpha remarkable for the solitary vascular strands of the sepals, the homocarpous adaxial carpellary traces, and the much-reduced abaxial carpellary bundle.

Species 1

Selected References

None.

Lower Taxa

... more about "Diamorpha"
perigynous +  and hypogynous +
Reid V. Moran +
Nuttall +
lobed +  and toothed +
subterete +  and oblong +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
not circumscissile +
whorled +, opposite +  and alternate +
Elf orpine +
not circumscissile +
se United States +
Greek diamorphe, contrary or different form, alluding to fruit compared with that of related genera +
axillary +  and terminal +
alternate +  and crowded +
persistent +
connate +
semi-inferior +  and superior +
tenuinucellate +, crassinucellate +  and bitegmic +
perigynous +  and hypogynous +
distinct +
0 cm0 mm <br />0 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
(3-)4-5(-12)[-30+]-carpellate +
spreading +  and erect +
Gen. N. Amer. Pl. +
subglobose-ovoid +
1 +  and many +
adnate +  and free +
antipetalous +
2 times as many as sepals +
branching +  and simple +
distinct +
2+ times shorter than ovary +
Diamorpha +
Crassulaceae +
not conspicuous +
perennial +, biennial +  and annual +