creeping spiderling, more...
[Boerhavia watsonii Standl.]
© 2012 Richard Spellenberg
annual; taproot tapered, soft or ± woody. Stems
erect or ascending, sparingly branched throughout, 30-70 dm, densely glandular-villous, or glandular-puberulent, with spreading, nonglandular hairs basally, glabrous distally. Leaves
mostly in basal 1
/2; larger leaves with petiole 10-30 mm, blade oval, oblong, ovate, or ± triangular, 18-45 × 13-30 mm (distal leaves usually smaller, sometimes longer, proportionately narrower), adaxial surface lightly to densely glandular-pubescent, abaxial surface paler than adaxial, lightly to densely glandular-pubescent, neither surface punctate or both minutely punctate with clusters of brown cells, base truncate, round, or obtuse, margins sinuate, sometimes crisped, apex round to obtuse, rarely acute. Inflorescences
terminal and axillary, branched 1-4 times unequally, with sticky internodal bands; branches strongly ascending, terminating in spicate or racemose flower clusters, axis 10-55 mm. Flowers:
pedicel 0.4-2.3[-3.7] mm; bracts at base of perianth usually soon deciduous, usually 2, narrowly to broadly lanceolate, 0.7-1.8 mm, apex often acuminate; perianth white to pale pink, campanulate distal to constriction, 1-1.3 mm; stamens (2-)3, slightly exserted or included. Fruits
5-33 per cluster, usually overlapping or 2-4 in group separated by small gap from next group, straw colored to grayish or reddish tan, broadly obovoid, 1.9-2.4(-2.8) × 1.1-1.3 mm (l/w: 1.7-2.1[-2.3]), apex rounded, glabrous; ribs 5, obtuse-rounded to obtuse, often with low winglike ridge, slightly rugose near sulci; sulci (0.2-)0.5 times as wide as base of ribs, slightly rugose, not papillate. 2n
= ca. 52. Flowering late summer-early fall. Sandy or rocky soils in open, arid grasslands, among open shrubs or mesquite and acacia woodlands [tropical deciduous forests]; [100-]700-1800 m; Ariz., N.Mex., Tex.; Mexico. C. F. Reed (1969) and subsequent authors have included one or more of Boerhavia coulteri, B. torreyana
, and B. watsoni
as synonymous with B. spicata
. Even when those taxa are removed, B. spicata
remains a variable species, widespread at low to middle elevations in southwestern North America, and distinguished by its mostly overlapping, obovoid fruits with rather open sulci, and the glandular pubescence on basal parts of the plant.
Plant: Annual erect forb to 70 cm with delicate branching stems; herbage glandular Leaves: leaves opposite, unequal in pair, oblong to ovate; 1-2 cm flowers tiny, pink, in elongate racemes, crowded Flowers: 1-2 cm flowers tiny, pink, in elongate racemes, crowded Fruit: clavate, 3-4 mm long, 5-angled with broad ridges and narrow furrows.
Wiggins 1964, FNA 2003, Kearney and Peebles 1969
Duration: Annual Nativity: Native Lifeform: Forb/Herb General: Erect or procumbent annual to 65 cm high, stems densely coarse, glandular-villous except those of upper inflorescence, often reddish. Leaves: Ovate or lanceolate, 1.5-5 cm, acute to narrowly acute at apex, the upper reduced and narrowly lanceolate, subsessile, margins entire or subsinuate, puberulent or short-villous, often glandular; petioles usually one-half to one-third as long as blade. Flowers: Cymose-paniculate, few branched, bracts beneath flowers deciduous, flowers white to pale pink, in short, dense slender spikes at the ends of branchlets. Fruits: Anthocarp 2.1-2.5 mm, narrowly obovoid, ridges smooth, broad. Ecology: Found on sandy soil, plains, washes, arroyos, disturbed habitats from 1,500-4,500 ft (457-1372 m); flowers September-October. Notes: Widespread and distinguished by its narrowly obovoid fruit, along with its 1-2 mm flowers. Ethnobotany: Unknown Etymology: Boerhavia is for Hermann Boerhaave (1663-1738) a Dutch botanist, spicata refers to the spicate flowers. Synonyms: Boerhavia torreyana Editor: SBuckley, 2010