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Vascular Plants of California
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Hesperochiron nanus

Higher Taxonomy
Family: HydrophyllaceaeView DescriptionDichotomous Key
Habit: Annual, perennial herb, generally hairy, generally taprooted. Stem: prostrate to erect. Leaf: simple to pinnately compound, basal or cauline, alternate or opposite; stipules 0. Inflorescence: cyme, generally raceme-like and coiled, or flowers 1. Flower: bisexual, generally radial; calyx lobes generally 5, generally fused at base, generally persistent, enlarging in fruit; corolla rotate to cylindric, generally deciduous, lobes generally 5, appendages in pairs on tube between filaments or 0; stamens generally 5, epipetalous, filament base sometimes appendaged, appendages scale-like; ovary generally superior, chambers 1 or 2, placentas 2, parietal, enlarged into chamber, sometimes meeting so ovary appears 2--5-chambered, style 1, style branches 2, stigmas generally head-like. Fruit: capsule, generally loculicidal; valves generally 2.
Genera In Family: 12 genera, 240--260 species: especially western US; some cultivated (Emmenanthe, Nemophila, Phacelia). Note: Included in Boraginaceae in TJM2 and some other treatments (Angiosperm Phylogeny Group IV 2016 Bot J Linn Soc 181:1--20) but treated as separate family (excluding Namaceae) by Boraginales Working Group (Luebert et al. 2016).
eFlora Treatment Author: Genevieve K. Walden, Robert W. Patterson & Richard R. Halse, except as specified
Scientific Editor: Bruce G. Baldwin
Genus: HesperochironView DescriptionDichotomous Key

Habit: Perennial herb, scapose; taprooted, root caudex-like, rhizomes present or 0. Leaf: simple, in basal rosette, minute- to short-hairy or sometimes glabrous in age, glandular-hairy or not; blade tapered to petiole or leaf sessile, linear-lanceolate to ovate, oblanceolate or elliptic, entire; petiole tapered to blade. Inflorescence: axillary from stem base, flowers 1 (few-flowered cyme in well-established plants); peduncle 2--5 cm, +- ascending to +- erect in flower, to 10+ cm, spreading in fruit, short- to long-hairy or glabrous in age. Flower: calyx lobes unequal in size and shape, enlarged in fruit, outer (2)3 broad, inner 2(3) narrow; corolla rotate or bell-shaped, throat yellow or white, lobes white to lavender, generally marked purple; corolla scales 0 or reduced; nectary glands 0; stamens included, unequal to +- equal, attached at 1 level, filaments widened at base, not appendaged, not winged; ovary chamber appearing 1, style 1, included or +- exserted, shallowly 2-lobed. Fruit: 5--11 mm, ovoid, hairy. Seed: 20--40, ovoid, angled, dark- or red-brown, honeycombed or pitted; attached fleshy structure 0.
Etymology: Greek: evening or western centaur
eFlora Treatment Author: Genevieve K. Walden, Robert W. Patterson & Richard R. Halse
Hesperochiron nanus (Lindl.) Greene
Habit: Plant 2--10 cm, 15+ cm diam; caudex generally simple, generally rhizomes 0. Leaf: generally > 6, generally not glandular-hairy; blade 1--5(7) cm, (0.5)1--2 cm wide, oblanceolate to elliptic or ovate; petiole 1--6(10) cm, sometimes buried in soil. Inflorescence: flowers generally > 5 per plant. Flower: calyx lobes 2--8 mm, 1--2 mm wide, linear-oblong to lanceolate-ovate in flower, 3--10 mm, 2--4 mm wide, broadly lanceolate to ovate in fruit, minute- to short-hairy, glandular or not; corolla 10--25(30) mm, bell-shaped or funnel-shaped, tube and throat generally white (tube yellow), lobes white or bluish-, purplish-, or pinkish-white, or rarely pink, sometimes pink- or lavender-veined, limb 10--20(25) mm diam, lobes oblong to oval, narrow, hairy adaxially; stamens 8--12 mm, filaments white or yellow; styles 3--8 mm. Fruit: 5--10 mm. Seed: 1.5--2 mm. Chromosomes: n=8.
Ecology: Wet meadows, flats, valleys; Elevation: 770--2620 m. Bioregional Distribution: KR, CaRH, SNH, Teh, WTR, SnBr, GB, s DMoj (Rabbit Springs, San Bernardino Co.); Distribution Outside California: to Washington, Montana, Wyoming, Utah, Baja California. Flowering Time: Apr--Jul Note: Previously treated as Hesperochiron californicus, but the name Nicotiana nana Lindl. has priority.
Synonyms: Hesperochiron californicus (Benth.) S. Watson; Capnorea californica (Benth.) Greene; Ourisia californica Benth.; Hesperochiron californicus var. benthamianus Brand; Hesperochiron californicus var. strigosus (Greene) Brand; Capnorea strigosa Greene; Hesperochiron californicus var. latifolius (Kellogg) Brand; Hesperochiron latifolius Kellogg; Hesperochiron californicus var. watsonianus (Greene) Brand; Capnorea watsoniana Greene; Hesperochiron californicus subvar. lasianthus (Greene) Brand; Capnorea lasiantha Greene; Hesperochiron californicus var. incanus (Greene) Brand; Capnorea incanus Greene; Hesperochiron californicus subvar. leporinus (Greene) Brand; Capnorea macilenta Greene; Capnorea nana (Lindl.) Raf.; Nicotiana nana Lindl.
Jepson eFlora Author: Genevieve K. Walden, Robert W. Patterson & Richard R. Halse
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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botanical illustration including Hesperochiron nanus

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Citation for this treatment: Genevieve K. Walden, Robert W. Patterson & Richard R. Halse 2021, Hesperochiron nanus, in Jepson Flora Project (eds.) Jepson eFlora, Revision 9,, accessed on June 13, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on June 13, 2024.

Hesperochiron nanus
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©2022 Dylan Neubauer

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Geographic subdivisions for Hesperochiron nanus:
KR, CaRH, SNH, Teh, WTR, SnBr, GB, s DMoj (Rabbit Springs, San Bernardino Co.)
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).