Nemacladus rubescens Greene

Nemacladus rubescens Greene, Bull. Calif. Acad. 1: 197. 1885
Plants usually much-branched and bushy, often 25 cm. tall and broad; rosette-leaves few-30; capsule about half-inferior, the apex rounded or obscurely pointed; corolla large, up to 5 mm. long, the lobes free almost to base, spreading; filament-tube glabrous, up to about 3 mm. long, often about equaling the corolla but appearing strongly exserted because of the spreading corolla-lobes and short tube; anthers up to 0.8 mm. long, often purplish; seeds broadly ellipsoid, 0.5-0.75 mm. long, bearing 8-12 undulate or zigzag longitudinal ridges and poorly defined pits between the ridges.
Type locality: Mojave Desert, California, M. K. Curran (Cal. Acad.!).
Lower part of stem silver>'-gray, shining; well developed plants with
diffuse and spreading branches and somewhat spreading,
rather lax pedicels; range centering in the deserts of southern
California, north to Kern and Inyo Counties. Leaves usually elliptic, entire or nearly so, mostly 2-3 times as
long as wide; pedicels much coarser than a human hair; stipe
of staminal appendage shorter than the reflexed terminal
cells, which are more than 0.5 mm. in length. 5a. N. rubescens var. rubescens.
Leaves oblanceolate, pinnatifid-toothed, mostly 5-8 times as
long as wide; pedicels finely capillary, the diameter about
equaling that of a human hair; stipe of staminal appendage
much longer than the spreading terminal cells, which are
much less than 0.5 mm. in length. 5i. A', rubescens var. tenuis.
Lower part of stem purplish or brownish, lacking a silvery-gray sheen; well developed plants with more or less stiffly ascending branches and pedicels; Sierra Nevada of central and northern California, south to Kem County. 5c. .V. rubescens var. interior.
5a. Nemacladus rubescens var. rubescens McVaugh, var. nov.
Nemacladus rubescens Greene, loc. cit., as to type.
Nemacladus adenophorus Parish, Bull. So. Calif. Acad. 2: 28. 1903. {Parish 4956, U. of Cal.!)
Nemacladus rigidus var. rubescens Munz, Am. Jour. Bet. 11: 245, in part. 1924. Branches repeatedly forked and spreading-flexuous, so that nearly all well developed plants are diffuse and bushy; plants 5-15 (25) cm. tall; stem slightly pubescent below, sometimes at very base only, or wholly glabrous, the lower part and often the branches as well with a conspicuous silvery-gray sheen; rosette leaves oblanceolate to elliptic, most often obtuse at tip and narrowed gradually to a broadly winged base, entire or obscurely toothed, when dry light yellowish-green or yellow, only very rarely purplish, the blades 0.3-0.7 era. wide by 0.71.8 (2.7) cm. long, 2-3 (5) times as long as wide; pubescence of leaves sparse, on lower part of margin, or lacking; pedicels somewhat ascending, leaving the stem at an angle of 90° or less, perfectly straight or slightly bowed upward at base, straight or flexuous at tip, the flower and capsule often turned upward; fruiting pedicels (6) 8-15 mm. long, slender but not finely capillary, distinctly thicker than a coarse human hair, smooth and glabrous; fiower-bracts lanceolate to ovate, glabrous, blunt at tip, 1-2 (3) mm. long, strongly decurrent at base, in dried material usually conduplicate so as partially to inclose the pedicel but mostly leaving the base of the pedicel visible on the upper side; corolla (1.5) 2.0-3.0 (3.5) mm. long, yellow or nearly white, with piurplish-brown markings toward the tips of the lobes, the tube very short (0.5 mm. or less), the margins of the lobes, at least the upper three, ciliate; filament-tube 2-3 mm. long, straight or very slightly curved above; appendages consisting of a stipe bearing 3-5 reflexed clavate cells 0.6-0.7 mm. in length and much exceeding the stipe; anthers 0.5-0.7 mm. long; hypanthium broadly rounded at base in anthesis, becoming cup-shaped or hemispheric in fruit; capsule obscurely pointed, 1.5-2.0 mm. in diameter, about as broad as high; calyx-lobes elliptic to deltoid-ovate, subacute, 0.7-1.2 (1.4) ram. long.
DlSTRiBCTnos: Mojave and Colorado Deserts, from Kern and San Diego Counties, California, to northern Baja California, western Arizona, and southern Nevada.
5b. Nemacladus albescens var. tenuis McVaugh, Am. Midi. Nat. 22: 536. 1939.
Branches several-times forked, spreading-flexuous and usually very diffuse, weakly zigzag below, the ultimate branchlets often practically straight; plants 9-20 cm. tall; rosette-leaves oblanceolate, subacute or blunt-pointed at tip, deeply pinnatifid with entire or toothed lobes, gradually narrowed to a long-drawn-out petiolar base, yellowish to green when dry, rarely purplish, their blades 0.15-0.4 cm. wide by (0.7) 1.0-2.3 cm. long, mostly 4-8 times as long as wide, sparsely pubescent on both surfaces, especially near base; pedicels wide-spreading, lea^ng the stem at an angle of 90° or somewhat less, mostly somewhat bowed upward near the middle and abruptly curved near tip so that the flower and fruit are erect or even slightly incurved; fruiting pedicels 10-17 mm. long, smooth and glabrous, capillary, the thickness about equaling that of a coarse human hair; bracts similar to those of var. riihcscens but somewhat more strongly folded, often concealing the base of the pedicel; flower essentially as in var. ruhescens, except for the anthers, which have an average length of 0.4-0.5 mm., and the staminal appendage which consists of a stipe 0.5-1.0 mm. in length, with 6-12 spreading terminal clavate cells less than 0.25 mm. in length; capsule 1.3-1.6 mm. in diameter by 1.5-2.0 ram. long; calyx-lobes mostly narrowly triangular, acute, (I.O) 1.2-1.7 (2.2) mm. long.
Type LOCAi.rrv: Eastern base of Indio Mt., Colorado Desert, Riverside County, California, llaU 5SI9 (US'.).
DisTRiBUTio.v: Southeastern California, principally in the Colorado Desert, north to Inyo County.
5c. Nemacladus rubescens var. interior (Munz) MeVaiigli, Am. Midi. Nat. 22: 537. 1939.
Semacladu: rigidu! var. interior Munz, Am. Jour. Hot. 11: 243. 1924.
Plants resembling those of var. ruhescens but taller and more strict, (7) 15-25 (32) cm. tall, the branches rather stiff and strongly ascending; stems brownish or purplish, dull or somewhat shining, never with a silvery-gray sheen; leaves similar to those of var. rubescens, but with mostly irregularly serrate margins, green to brownish or purplish when dry, rarely yellow, their blades 0.2-0.5 cm. wide by 0.4-2.2 cm. long, usually about twice as long as wide, narrowed gradually to a margined petiolar base or abruptly to a distinct petiole which may be 0.3-0.5 cm. long; pubescence almost none, rarely of a few hairs along the margins and on the upper surface near base; pedicels usually conspicuously ascending, mostly forming an angle of 60° or less with the stem, stiff and straight or essentially so or curved near the end, 7-13 (17) mm. long, about as thick as those of var. ruhescens, usually somewhat ciliate on upper side near base; flower-bracts linear to lanceolate, blunt, often slightly ciliate on margin, 1-3 (6) mm. long, scarcely or not at all enfolding the pedicel; corolla (2.0?) 2.5-5.0 mm. long, "pale lilac, blotched red-violet" (Keck 1175) or "white, pink-tinged on backs of lobes; each of the 3 lobes of the upper lip with transverse wine-red band near base and tint of yellow below the band" {CarloUa C. Hall 192), the lobes without ciliation on margin, nearlj' free, spreading; filamenttube 1.8-3.0 mm. long, appearing conspicuously exserted, somewhat curved above, glabrous throughout; appendages similar to those of var. rttbcscens, but the terminal cells shorter, about 0.4 mm. in length and equaling the stipe; anthers 0.5-0.8 mm. long; hypanthium turbinate or obconic in anthesis and in fruit, the base acute and narrowing rather gradually into the pedicel; capsule 1.3-2.0 mm. in diameter by 2.0-3.5 mm. long, the free part rounded or obscurely pointed and containing more seeds than the narrow inferior basal portion; calyx-lobes as in var. rubescens, 0.7-1.3 (1.5) mm. long; seeds like those of var. ruhescens in size and shape, their surface usually plainly pitted, the 10-12 rows of pits with 8-10 pits in each row.
Type locauty: "North Fork, Peckinpah, Fresno Co., California" (Madera County, according to maps), K. Brandegee (Pomona!).
Distribution: Western slopes of the Sierra Nevada, California, from Kem County to Butte County; doubtfully in southern Oregon.

Nemacladus rubescens là loài thực vật có hoa trong họ Hoa chuông. Loài này được Greene mô tả khoa học đầu tiên năm 1885.