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Fabaceae FAMILY

Lupinus rivularis

Lupinus rivularis

Edibility
0/5
Medicinal
2/5

Safety & Hazards

Lupinus species in general (and especially the seeds) contain a range of bitter-tasting alkaloids such as lupine, anagyrine, sparteine and hydroxylupanine. The pharmacological effects of these alkaloids are that they block ganglionic transmission, decrease cardiac contractility and contract uterine smooth muscle[1]. When ingested in moderate to large quantities they can cause symptoms such as respiratory depression and slow heartbeat, sleepiness and convulsions[2]. Alkaloid levels can vary greatly from species to species, and several members of the genus are used for food. In some species low-alkaloid, sweeter-tasting varieties have been developed. There are also techniques (particularly soaking and discarding the soak water) that lower the alkaloid levels. Unless it is known that the plant is low in alkaloids then caution should be applied to any ingestion of the plant[PFAF]. Fungal toxins can readily invade the crushed seed and can cause chronic illness[3].

Cultivation Details

HabitAnnual/Perennial
Growth—

Lupinus rivularis is not a very cold-hardy plant, able to tolerate temperatures down to around -8°c when fully dormant, though probably hadier than this if the summers are hot. It is found at elevations up to 1,800 metres, growing in areas where the mean annual rainfall can range from 450 - 2,500mm[4]. Requires a sunny position. Plants are found in the wild on well-drained, sandy or gravelly soils[4]. In cultivation it generally grows well if given a sunny position in a deep, well-drained, moderately fertile soil with a neutral to slightly acid pH[5]. A fast-growing plant, quickly developing a deep taproot[4]. The plant is often annual to biennial in habit, and is more likely to live longer when growing on soils low in nitrogen, such as sand dunes, cut slopes along roadsides, or dredge spoils where competition is reduced[4]. The plant’s showy floral display and pleasant scent make it appropriate for certain landscape uses along roadsides, around residential areas, and within parks where a larger, short-lived wildflower is desired[4]. For seed production, the crop should be harvested just before fully mature to avoid excessive shatter. Green seeds thus harvested have dried without any apparent loss in viability[4]. Closely related to Lupinus latifolius[5]. This species has a symbiotic relationship with certain soil bacteria; these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby[6].

Propagation

Pre-soak the seed for 24 hours in warm water and sow in mid spring in situ[7, 5]. You may need to protect the seed from mice. Germination should take place within 2 weeks. Cite as: Temperate Plants Database, Ken Fern. temperate.theferns.info. 2026-02-21. <temperate.theferns.info/plant/Lupinus+rivularis>

Pollinators

Bees, Insects

References

  1. [1]Protabase - Plant Resources of Tropical Africa. — http://www.prota.org ↩︎An excellent on-line database with detailed information on over 3,200 species of useful plants of Africa.
  2. [2]Poisonous Plants of North Carolina — http://www.ces.ncsu.edu/depts/hort/consumer/poison/poison.htm ↩︎An excellent concise but comprehensive guide to toxic plants that grow in N. Carolina. It lists even those plants that are of very low toxicity, including several well-known food plants such as carrots and potatoes.
  3. [3]A Colour Atlas of Poisonous Plants. — Frohne. D. and Pfänder. J. · Wolfe · 1984 · ISBN 0723408394 ↩︎Brilliant. Goes into technical details but in a very readable way. The best work on the subject that I've come across so far.
  4. [4]Plants Database — United States Department of Agriculture · http://plants.usda.gov/java/factSheet ↩︎An online database with an excellent collection of fact sheets about native N. American plants.
  5. [5]The New RHS Dictionary of Gardening. 1992. — Huxley. A. · MacMillan Press · 1992 · ISBN 0-333-47494-5 ↩︎Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
  6. [6]The Leguminosae; A Source Book of Characteristics, Uses and Nodulation — Allen O.N.; Allen E.K. · University of Wisconsin · 1981 · ISBN 0-333-32221-5 ↩︎An amazing and comprehensive work, giving a brief guide to the many genera of the family Fabaceae and also the principle uses of the genus.
  7. [7]RHS Dictionary of Plants plus Supplement. 1956 — F. Chittendon. · Oxford University Press · 1951 · ISBN - ↩︎Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaced in 1992 by a new dictionary (see [ 200 ]).
  8. [8]A California Flora. — Munz P.A. & Keck D.D. · University of California Press; Los Angeles · 1959 · ISBN - ↩︎An excellent flora but no pictures. Not for the casual reader.
  9. [PFAF]Plants for a Future — pfaf.org ↩︎