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Calyptridium monospermum

One-seeded Pussypaws

Family MontiaceaeGenus Calyptridium

Rounded pink flower clusters on red stalks radiating from a flat rosette of gray-green spoon-shaped leaves on bare grit
FlowerEric in SFCC BY-SA 3.0

About the plant

What it is and where it grows — not part of any germination protocol.

Habit
perennialPlants of the World Online
Flower
White, pinkWikipedia
Native range
California, Mexico Northwest, Nevada, OregonGBIF Backbone Taxonomy

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; Wikipedia — Wikipedia contributors; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around March 8, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 28 days to germinate.

82% germination in 7–28 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Calyptridium p. 27Public domain
Show the original text
Calyptridium (Portulacaceae). C. monospermum has been added. C. monospermum germ. 70L(82% in 1-4 w), 70 GA-3(75% in 2nd w), 70D(31% in 1-4 w), and 40-70D(74% in 4-18 d). Outdoor treatment reduced germination to 12% probably because the -20 deg. was largeiy fatal.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Calyptridium p. 27. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 14 days to germinate.

75% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Calyptridium p. 27Public domain
Show the original text
Calyptridium (Portulacaceae). C. monospermum has been added. C. monospermum germ. 70L(82% in 1-4 w), 70 GA-3(75% in 2nd w), 70D(31% in 1-4 w), and 40-70D(74% in 4-18 d). Outdoor treatment reduced germination to 12% probably because the -20 deg. was largeiy fatal.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Calyptridium p. 27. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 3

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around December 18, 2026 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: dark

about 3 months from start to step 2. Germination happens during step 2, in 18 days.

74% germination in 4–18 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Calyptridium p. 27Public domain
Show the original text
Calyptridium (Portulacaceae). C. monospermum has been added. C. monospermum germ. 70L(82% in 1-4 w), 70 GA-3(75% in 2nd w), 70D(31% in 1-4 w), and 40-70D(74% in 4-18 d). Outdoor treatment reduced germination to 12% probably because the -20 deg. was largeiy fatal.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Calyptridium p. 27. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 4

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 8, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 28 days to germinate.

31% germination in 7–28 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Calyptridium p. 27Public domain
Show the original text
Calyptridium (Portulacaceae). C. monospermum has been added. C. monospermum germ. 70L(82% in 1-4 w), 70 GA-3(75% in 2nd w), 70D(31% in 1-4 w), and 40-70D(74% in 4-18 d). Outdoor treatment reduced germination to 12% probably because the -20 deg. was largeiy fatal.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Calyptridium p. 27. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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