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Rhinotropis acanthoclada

THORNY MILKWORT

Higher Taxonomy
Family: PolygalaceaeView Description 
Common Name: MILKWORT FAMILY
Habit: [Annual] perennial herb, subshrub, shrub [tree, vine]; hairs unbranched. Leaf: simple, generally alternate (opposite or whorled); veins pinnate; margin generally +- entire; stipules generally 0. Inflorescence: raceme, spike, or panicle. Flower: bisexual, generally bilateral and +- pea-flower-like [or +- radial]; sepals 5, fused or not, lateral or inner pair generally larger and petal-like (called wings); petals 5[3], fused to stamen tube, [+- similar or] different with 1 lower keel petal, 2 strap-like upper petals, and 2[0] lateral petals; stamens 3--10, +- fused, tube open at top; ovary chambers 1--8 with 1 ovule each, style 1 or 0. Fruit: capsule [drupe or nut; occasionally winged]. Seed: often with aril.
Genera In Family: 29 genera, 1000 species: especially tropics, subtropics, few cultivated.
eFlora Treatment Author: Robert E. Preston & Thomas L. Wendt
Scientific Editor: Bruce G. Baldwin.
Genus: RhinotropisView DescriptionDichotomous Key


Common Name: MILKWORT
Habit: Root odor generally wintergreen. Inflorescence: raceme, occasionally grouped and panicle-like; cleistogamous flowers occasionally solitary. Flower: bilateral; lateral 2 sepals enlarged; petals 3 or 5, keel petal generally with cylindric beak; stamens 6--8, anthers dehiscent at tip, appearing 1-chambered; with nectary disk or gland; ovary chambers 2, stigma 2-lobed. Fruit: capsule. Seed: fusiform or ovoid, black, generally hairy, generally with prominent white aril on 1 end.
Etymology: (Greek: snout keel, for beaked keel petal) Note: Polygala as treated broadly in TJM2 is not monophyletic; all CA milkworts now in Rhinotropis (Abbott 2011).
eFlora Treatment Author: Robert E. Preston & Thomas L. Wendt
Reference: Wendt 1979 J Arnold Arbor 60:504--514; Abbott 2011 JBRIT 5:125--137
Rhinotropis acanthoclada (A. Gray) J.R. Abbott
NATIVE
Habit: Subshrub, shrub; hairs spreading. Stem: sprawling to erect, < 10 dm, twigs densely hairy, white. Leaf: 5--25 mm, oblanceolate to narrowly elliptic or obovate, hairy. Inflorescence: thorn-tipped; flowers 1--15; pedicel 1.5--5.8 mm, hairy. Flower: 3--5.3 mm; outer sepals hairy, wings cream; keel petal beak 0 or minute. Fruit: 4--6 mm including stalk. Seed: 2--2.5 mm including hairs; aril glabrous. Chromosomes: 2n=18.
Ecology: Desert scrub, Joshua-tree or pinyon/juniper woodland, generally in loose, sandy or gravelly soil; Elevation: 945--1830 m. Bioregional Distribution: s DMoj (Lucerne Valley), DMtns (Eagle, New York mtns); Distribution Outside California: to southern Utah, Arizona. Flowering Time: May--Aug
Synonyms: Polygala acanthoclada A. Gray
Jepson eFlora Author: Robert E. Preston & Thomas L. Wendt
Reference: Wendt 1979 J Arnold Arbor 60:504--514; Abbott 2011 JBRIT 5:125--137
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
Listed on CNPS Rare Plant Inventory

Previous taxon: Rhinotropis
Next taxon: Rhinotropis californica

Botanical illustration including Rhinotropis acanthocladabotanical illustration including Rhinotropis acanthoclada


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Citation for this treatment: Robert E. Preston & Thomas L. Wendt 2022, Rhinotropis acanthoclada, in Jepson Flora Project (eds.) Jepson eFlora, Revision 11, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=107534, accessed on January 25, 2025.

Citation for the whole project: Jepson Flora Project (eds.) 2025, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on January 25, 2025.

No expert verified images found for Rhinotropis acanthoclada.



Geographic subdivisions for Rhinotropis acanthoclada:
s DMoj (Lucerne Valley), DMtns (Eagle, New York mtns) 		MAP CONTROLS
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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 occurrence).






 

Data provided by the participants of the  Consortium of California Herbaria.

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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.
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CCH collections by month Flowering-Fruiting Monthly Counts

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).