Pterospora

Nuttall

Gen. N. Amer. Pl. 1: 269. 1818 ,.

Etymology: Greek pteron, wing, and spora, sown seed, alluding to membranous wing on each seed
Treatment appears in FNA Volume 8. Treatment on page 389. Mentioned on page 373.

Herbs, achlorophyllous, heterotrophic. Stems absent. Leaves absent. Inflorescences racemes, erect at emergence from soil, axis fleshy and fibrous, persistent after seed dispersal, pink to reddish or brownish, 0.5–1.5 cm diam. proximal to proximalmost flower. Pedicels decurved, somewhat longer in fruit; bracteoles absent. Flowers radially symmetric, nodding; sepals 5, distinct, lanceolate-ovate; petals 5, connate, cream to yellowish or white, without basal tubercles, (surfaces glabrous), corolla urceolate; intrastaminal nectary disc present; stamens 10, included; filaments broader proximally than distally, glabrous; anthers depressed-ovoid to ovoid, with awns, without tubules, dehiscent by 2 oval slits; pistil 5-carpellate; ovary 5-locular; placentation axile; style straight, slender; stigma capitate, without subtending ring of hairs. Fruits capsular, pendulous, dehiscence acropetally loculicidal, no cobwebby tissue exposed by splitting valves at dehiscence. Seeds 100+, ovoid, with broad, rounded, membranous wing attached at 1 end. x = 8.

Distribution

North America, n Mexico

Discussion

Species 1: North America, n Mexico.

Species 1

Selected References

None.

"broader" is not a number.

... more about "Pterospora"
depressed-ovoid +  and ovoid +
Gary D. Wallace +
Nuttall +
pink;reddish or brownish +
persistent +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
fibrous +  and fleshy +
acicular;plane +
coriaceous +
pseudoverticillate +, in basal rosettes +  and alternate +
persistent +  and deciduous +
rotate to crateriform campanulate cylindric globose or urceolate +
North America +  and n Mexico +
undifferentiated +
fusiform +
Greek pteron, wing, and spora, sown seed, alluding to membranous wing on each seed +
unisexual +  and bisexual +
loculicidal +
multicellular +
whorled +, , +, opposite +, pseudoverticillate +  and alternate +
persistent +
scale-like +
reduced +
revolute;plane;toothed;entire;revolute;plane;toothed;entire +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
reduced +
not sticky +
Gen. N. Amer. Pl. +
not +  and winged +
distinct +
distinct +
lanceolate-ovate +
decumbent +  and erect +
peltate +  and capitate +
straight +
slender +
Undefined subfam. Pyroloideae +, Undefined tribe Monotropaceae +  and Undefined tribe Pyrolaceae +
Pterospora +
Ericaceae subfam. Monotropoideae +
evergreen +, deciduous +  and perennial +
rounded +
membranous +