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Family Amaryllidaceae
Rain lily
Zephyranthes rosea Lindl.
STORM LILY

Scientific names Common names
Amaryllis carnea Schult. & Schult.f. Cuban zephyrlily (Engl.)
Amaryllis rosea (Lindl.) Spreng. [Illegitimate] Fairy lily (Engl.)
Atamosco rosea (Lindl.) Greene Pink rain lily (Engl.)
Zephyranthes carnea (Schult. & Schult.f.) D.Dietr. Rain lily (Engl.)
Zephyranthes rosea Lindl. Rose fairy lily (Engl.)
  Rosy rain lily (Engl.)
  Storm lily (Engl.)
Zephyranthes rosea Lindl. is an accepted name The Plant List

Other vernacular names
FRENCH: Lis zéphyr rose.
GERMAN: Rosafarbene, Windlbume.
SPANISH: Duende rojo, Leli de San Jose.
VIETNAMESE: Tóc tiên hồng.

General info
Rain lily names derives from its characteristic for blooming only after heavy rains. Zephyranthes rosea literally comes from the Greek zephuros (an anemoi) and anthos (flower). Zephyros, the Greek personification of the west wind, is also associated with rainfall. The species name rosea comes from Latin for "rosy." (6)

Botany
Zephyranthes rosea is a low-growing, stemless, rosette-like herb with tunicated, ovoid bulb. Leaves are grassy, shiny, linear, all basal, thick, flat, and fleshy. Scape is slightly compressed, erect, green, arising from the elongation of the bulb to flowering, slightly longer than the leaves, bearing a single flower. Perianth is pink to purple, tube is funnel-shaped, 4 centimeters long with six oblong lobes, 1 to 1.5 centimeters wide; the inner three are narrower than the somewhat spreading outer ones. Stamens are six, yellow-anthered, with filaments attached to the throat of the perianth tube. Filiform style extends into a 3-lobed stigma, towering above the stamens. Ovary is 3-celled and grows into a 3-valved capsule which is more of less globose.

Distribution
- Introduced into the Philippines, now widespread at low and medium altitudes.
- Cultivated as an ornamental plant.
- Naturalized to tropical America, Asia, Australia and some Pacific Islands.

Constituents
- Bulbs yield lycorine, galanthamine, epimaritidine, crinamine, haemanthamine, maritidine.
- Study yielded an alkaloid, (+)-epimaritinine. (see study below) (2)

Properties
- Toxicity: Bulbs of some Zephyranthes species contain various toxic alkaloids including lycorine and haemanthamine. They can cause vomiting, convulsions, and death to humans, livestock, and poultry. Although rain lily bulbs are considered to have low toxicity, homeowners must be aware of the poisonous potential of rainlily. (3)

Parts utilized
- Bulbs.

Uses

Folkloric
- No reported folkloric medicinal use in the Philippines.
- In China, used for treating breast cancer.
- In India, bulb extracts of Z. rosea and Z. flava used for treatment of diabetes, ear and chest ailments, and viral infections.

Studies
Lectins / Agglutination Effect / Potential for Bacterial Typing:
102 plant extracts from 13 monocot families in Vietnam were screening for lectin activity. Zephyranthes rosea had an agglutinating effect on Staph aureus suggesting a potential for a classification scheme for bacterial typing. The tuber showed the highest lectin activity. (1)
(+)-epimaritidine / Alkaloid: Study isolated (+)-epimaritidine, an alkaloid from Zephyranthes rosea. (+)-Epimaritidine comprises a missing link in the C-3 epimeric pairs of 5,10b-ethanophenanthridine alkaloids of the vittatine-haemanthamine type. (2)

Availability
Wild-crafted.

© Godofredo U. Stuart Jr., M.D.


Updates March 2017, October 2015
March 2012


IMAGE SOURCE: Photo: File:Zephyranthes rosea.jpg / File:Zephyranthes rosea.jpg / potocraze - Grouping Uploaded by Epibase / CC BY-SA 2.0 / Wikipedia
IMAGE SOURCE: Zephyranthes rosea / File:Zephyranthes rosea (Mindanao, Philippines) 2.jpg / Obsidian Soul / Creative Commons Attribution 3.0 / Wikipedia

Additional Sources and Suggested Readings
(1)
Screening of Monocot Lectins in Vietnam and Using Them in Bacteria Typing
/ Bui Phuong Thuan, Le Quy Thuong / KKU Science Journal Volume 37 (Supplement)
(2)
(+)-Epimaritidine, an alkaloid from Zephyranthes rosea / Shibnath Ghosal, Ashutosh, Sushma Razdan / Phytochemistry (1985), Volume: 24, Issue: 3, Pages: 635-637
(3)
Rainlily, Zephyranthes and Habranthus spp.: Low Maintenance Flowering Bulbs for Florida Gardens / Gary W. Knox / EDIS
(4)
Phytochemistry and Pharmacology of Genus Zephyranthes / Katoch D and Singh B* / Singh and Katoch, Med Aromat Plants 2015, 4:4
(5)
Zephyrathes rosea / Synonyms / The Plant List
(6)
Zephyranthes rosea / Wikipedia

It is not uncommon for links on studies/sources to change. Copying and pasting the information on the search window or using the DOI (if available) will often redirect to the new link page.

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