Aristocapsa

Reveal & Hardham

Phytologia 66: 84. 1989.

Common names: Valley spinycape
Etymology: Latin arista, awn, and capsa, box, alluding to awned involucres
Treatment appears in FNA Volume 5. Treatment on page 475. Mentioned on page 220, 446.

Herbs, annual; taproot slender. Stems arising directly from the root, erect, solid, not fistulose or disarticulating into ringlike segments, glandular. Leaves usually quickly deciduous, basal, rosulate; petiole present; blade linear-spatulate. Inflorescences terminal, cymose; branches dichotomous, not brittle or disarticulating into segments, round, glandular; bracts 3, positioned to side of node opposite involucre, connate basally, oblong to linear-acicular, long-awned, glandular. Peduncles erect, peglike. Involucres 1 per node, 5-ribbed, tubular, narrowly turbinate; teeth 5, awn-tipped. Flowers (4–) 6 per involucre; perianth white to pink or rose, campanulate when open, cylindric when closed, pubescent abaxially; tepals 6, connate proximally, monomorphic, entire apically; stamens 9; filaments free, glabrous; anthers red to maroon, oblong. Achenes mostly included, light greenish brown to tan, not winged, 3-gonous, glabrous. Seeds: embryo curved. x = 14.

Discussion

Species 1.

Aristocapsa may be distinguished from other Eriogonoideae by the combination of five-awned involucres that are slightly corrugated, three-parted inflorescence bracts that are awn-tipped, and (4–)6 flowers per involucre. The base chromosome number is unique in tribe Eriogoneae. Pterostegia (tribe Pterostegieae) is the only other genus of the subfamily with that number. Among Chorizanthineae, only Centrostegia and Aristocapsa have curved embryos, the condition usually found in Eriogonineae.

Selected References

None.

"/2" is not declared as a valid unit of measurement for this property.

... more about "Aristocapsa"
3-gonous +
red +  and maroon +
James L. Reveal +
Reveal & Hardham +
stipelike +
awn-tipped +  and simple +
linear-spatulate +
pubescent +  and glabrous +
scale-like +  and leaflike +
disarticulating +  and dichotomous +
not brittle +
just below the soil surface or and above the soil surface +  and spreading +
Valley spinycape +
wc Calif. +
Latin arista, awn, and capsa, box, alluding to awned involucres +
unisexual +  and bisexual +
disarticulating +  and solid +
decumbent to erect +  and prostrate +
unwinged +  and winged +
black +, red +, brown +  and yellowish +
exserted +  and included +
pubescent +  and glabrous +
spheroidal +, 4-gonous +, lenticular +, biconvex +, discoid +, 3-gonous +  and 2-gonous +
cymelike +, paniclelike +, racemelike +  and spikelike +
connate +  and free +
turbinate +  and tubular +
nonmembranous +
in whorls +, opposite +, alternate +  and rosulate +
deciduous +
cauline +  and basal +
bractlike +
pubescent +  and glabrous +
lobed +, undulate +, crisped +, crenulate +  and entire +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
cylindric +  and campanulate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
homostylous +  and 3-carpellate +
, +  and solid +
slender;stout +
disarticulating +  and solid +
decumbent to spreading or erect +  and prostrate +
erect +  and arising +
not fistulose +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
? (?) +  and ? (?) +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
chambered +, , +  and solid +
Aristocapsa +
Polygonaceae subfam. Eriogonoideae +
lobed +  and laciniate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
3 +, 2 +  and 1 +