Boerhavia intermedia

M. E. Jones

Contr. W. Bot. 10: 41, unnumbered fig. at end of is sue. 1902.

Illustrated
Synonyms: Boerhavia erecta var. intermedia (M. E. Jones) Kearney & Peebles
Treatment appears in FNA Volume 4. Treatment on page 23. Mentioned on page 19, 20, 2.

Herbs, annual; taproot tapered, soft or ± woody. Stems usually erect or ascending, occasionally decumbent, moderately or profusely branched primarily distally, 2–6 (–8) dm, minutely puberulent with bent hairs basally, glabrous or minutely puberulent distally. Leaves mostly in basal 1/2 of plant; larger leaves with petiole 7–25 mm, blade broadly ovate or oval to lanceolate, 20–45 × 7–16 mm (distal leaves smaller, sometimes longer, proportionately narrower), adaxial surface usually glabrous, occasionally glandular-puberulent, often minutely punctate, abaxial surface paler than adaxial, glabrous or glabrate, usually punctate with small patches of reddish or brownish cells, base round, obtuse, or truncate, margins entire or slightly sinuate, apex acute, obtuse, or round. Inflorescences terminal, forked ca. 3–6 times ± evenly (or clearly unevenly), diffuse, usually with sticky internodal bands; branches strongly ascending, terminating in umbels or flowers borne singly, occasionally subumbellate (all pedicels not attaching at same point), rarely irregularly compound umbels. Flowers: pedicel 0.5–3.2 mm; bracts at base of perianth quickly deciduous, (1–) 2, narrowly lance-acuminate, 0.5–1 mm; perianth whitish to pale-pink or purplish, campanulate distal to constriction, 0.7–1.2 [–2] mm; stamens 2–3, included or barely exserted. Fruits 1–15 per cluster, straw colored or gray-brown, obconic, broadly low conic, 2–2.8 (–3.2) × 0.7–1.3 mm (l/w: 1.7–3.2), apex nearly truncate, glabrous; ribs (4–) 5, acute, slightly rugose or undulate near sulci; sulci 0.2–1 times as wide as base of ribs, coarsely transversely rugose, smooth or very faintly papillate. 2n = 52, ca. 54.


Phenology: Flowering summer–late fall.
Habitat: Sandy or gravelly areas in deserts and arid grasslands, disturbed areas
Elevation: [0-]100-1700 m

Distribution

V4 33-distribution-map.gif

Ariz., Calif., Nev., N.Mex., Tex., Mexico (Baja California), Mexico (Baja California Sur), Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (Sonora)

Discussion

Boerhavia intermedia is a wide-ranging and variable species of the arid areas of southwestern North America. Ordinarily, the terminal inflorescence is an umbel of at least a few flowers. Plants with few-flowered umbels often have only one flower at some of the terminal inflorescences. Plants with predominantly or entirely one-flowered terminal inflorescences occasionally occur in the eastern part of the range. To the west, and especially on the Coloradan portion of the Sonoran Desert and on the Baja California peninsula, plants with one-flowered terminal inflorescences are more frequent, and even though those have five-ribbed fruits, they often have been identified as B. triquetra. In that region, such plants may have proportionately broader fruits as the ribs become more winglike. Some plants in southern California bear a few fruits with four angles, and in this respect are intermediate to B. triquetra.

Selected References

None.

Lower Taxa

None.

"thin" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Boerhavia intermedia"
glabrate +  and glabrous +
glandular-puberulent +  and glabrous +
Richard W. Spellenberg +
M. E. Jones +
glutinous +
deciduous +
obtuse +  and round +
unequal +
woody +, leathery +  and fleshy +
2 cm20 mm <br />0.02 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
oval;lanceolate +
7mm;16mm +
deciduous +  and persistent +
distinct +
lance-acuminate +
minute +  and not accrescent +
corollalike +  and petaloid +
brownish +  and reddish +
Ariz. +, Calif. +, Nev. +, N.Mex. +, Tex. +, Mexico (Baja California) +, Mexico (Baja California Sur) +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +  and Mexico (Sonora) +
[0-]100-1700 m +
curved +  and straight +
inconspicuous +  and showy +
1 +  and 80 +
chasmogamous +  and bisexual +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
gray-brown +  and straw colored +
2mm;2.8mm +
1 (?) +  and 15 (?) +
conic +  and obconic +
coriaceous +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
Sandy or gravelly areas in deserts and arid grasslands, disturbed areas +
thyrsiform +, cymose +  and pedunculate +
3-6 times diffuse with sticky internodal bands +
unequal +
(4-)5-lobed +
pubescent +  and glabrous +
sinuate +  and entire +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +  and 0.32 cm3.2 mm <br />0.0032 m <br /> (?) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
campanulate +
constricted +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Flowering summer–late fall. +
Contr. W. Bot. +
glandular-pubescent +, glabrous +  and smooth +
undulate +  and acute +
thick +  and thin +
fibrous;fleshy +
membranaceous +
ribbed +, 10-ribbed +  and 5-ribbed +
pubescent +, glabrous +  and warty +
wrinkled +
Illustrated +
exserted +  and included +
ascending +  and erect +
fusiform +  and linear +
filiform +
papillate +  and rugose +
0.2-1 times as wide as base +
Boerhavia erecta var. intermedia +
woody +  and soft +
Boerhavia intermedia +
Boerhavia +
species +
umbellate +, subumbellate +, spicate +  and cymose +
capitate +  and subcapitate +
singly +  and racemose +
gland-tipped +
expanded +
compound +  and subumbellate +
pubescent +, glabrous +  and glandular +
fusiform +  and ropelike +