Acanthoscyphus

Small

Bull. Torrey Bot. Club 25: 53. 1898.

Common names: Flowery puncturebract
Etymology: Greek acantha, thorn, and scyphos, cup, alluding to awn on involucre
Synonyms: Oxytheca sect. Acanthoscyphus (Small) Ertter
Treatment appears in FNA Volume 5. Treatment on page 437. Mentioned on page 221, 439.
 TaxonIllustrator 
FNA5 P44 Oxytheca dendroidea s dendroidea.jpegOxytheca dendroidea subsp. dendroidea
Acanthoscyphus parishii var. parishii
Sidotheca caryophylloides

Herbs, annual; taproot slender. Stems arising directly from the root, erect to somewhat spreading, solid, not fistulose or disarticulating into ringlike segments, glabrous, partially glandular. Leaves usually persistent through anthesis, basal, rosulate; petiole indistinct; blade broadly obovate or spatulate to oblong or oblanceolate, margins ciliate-denticulate. Inflorescences terminal, cymose; branches dichotomous, not brittle or disarticulating into segments, round, glabrous except for glandular nodes and proximal 1/2 of internode; bracts 2–3, connate basally, scalelike, triangular to lanceolate or subulate, awned at proximal nodes, glabrous or sparsely glandular. Peduncles erect to deflexed. Involucres 1 per node, not ribbed, tubular, turbinate; teeth 4 (–5) or 7–30 (–36), 1/2 to completely connate, awn-tipped, glandular distally adaxially. Flowers 3–10 (–20) per involucre at any single time during full anthesis; perianth white to rose, occasionally greenish white to cream, broadly campanulate when open, narrowly urceolate when closed, hirsute to strigose and sparsely glandular abaxially; tepals 6, connate 1/4–1/3 their length, monomorphic, entire or rarely irregularly divided apically; stamens 9; filaments basally adnate, glabrous or sparsely pubescent basally; anthers red to maroon, oblong to oval. Achenes usually included, dark-brown to deep maroon, not winged, globose-lenticular, glabrous. Seeds: embryo curved. x = 20.

Discussion

Species 1.

Acanthoscyphus is allied to Eriogonum subg. Ganysma, specifically to E. parishii, E. apiculatum, and their close relatives. It is distinguished from Eriogonum by its awned involucres.

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

... more about "Acanthoscyphus"
dark-brown;deep maroon +
globose-lenticular +
red +  and maroon +
oblong +  and oval +
James L. Reveal +
stipelike +
awn-tipped +  and simple +
spatulate;oblong or oblanceolate +
glandular +  and glabrous +
triangular +  and lanceolate or subulate +
disarticulating +  and dichotomous +
not brittle +
just below the soil surface or and above the soil surface +  and spreading +
Flowery puncturebract +
s Calif. +
Greek acantha, thorn, and scyphos, cup, alluding to awn on involucre +
pubescent +  and glabrous +
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 +
persistent +
cauline +  and basal +
bractlike +
pubescent +  and glabrous +
ciliate-denticulate +
not swollen +
orthotropous +
accrescent +
curved +  and straight +
erect to deflexed +
hirsute +  and strigose +
urceolate +  and campanulate +
accrescent +
fleshy +, indurate +  and membranous +
with extrafloral nectaries +  and not articulate +
homostylous +  and 3-carpellate +
Bull. Torrey Bot. Club +
ertter1980a +
, +  and solid +
slender;stout +
disarticulating +  and solid +
decumbent to spreading or erect +  and prostrate +
spreading +, erect to somewhat +  and arising +
not fistulose +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
coriaceous +  and membranous +
consisting of a series +  and tubular +
distinct +
erect;spreading or recurved +
Oxytheca sect. Acanthoscyphus +
chambered +, , +  and solid +
Acanthoscyphus +
Polygonaceae subfam. Eriogonoideae +
1/4 +  and 1/3 +
divided +  and entire +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
3 +, 2 +  and 1 +