Grŵp o blanhigion fasgwlar o'r genws Equisetum yw marchrawn, yr unig aelodau o'r dosbarth Equisetopsida sy'n goroesi heddiw. Mae marchrawn yn tyfu mewn cynefinoedd llaith ledled y byd.[2] Mae ganddynt goesynnau a rhisomau cymalog ac mae gan rai rhywogaethau gylchoedd o ganghennau.[1] Maent yn cynhyrchu "conau" (strobili) sy'n cynnwys y sborau.[2]
| Marchrawn Amrediad amseryddol: Jwrasig Canol – Holosen, 164.7–0 Miliwn o fl. CP | |
|---|---|
 | |
| Marchrawnen fawr (Equisetum telmateia) | |
| Dosbarthiad gwyddonol | |
| Teyrnas: | Plantae |
| Rhaniad: | Pteridophyta |
| Dosbarth: | |
| Urdd: | Equisetales |
| Teulu: | Equisetaceae |
| Genws: | Equisetum L. |
| Rhywogaethau | |
|
Tua 15, gweler y rhestr[1] | |
Rhywogaethau
Is-enws Equisetum
- Marchrawnen yr ardir, Equisetum arvense
- Equisetum bogotense
- Equisetum diffusum
- Marchrawnen y dŵr, Equisetum fluviatile
- Marchrawnen y gors, Equisetum palustre
- Marchrawnen y cysgod, Equisetum pratense
- Marchrawnen y coed, Equisetum sylvaticum
- Marchrawnen fawr, Equisetum telmateia
Is-enws Hippochaete
- Equisetum giganteum
- Marchrawnen y gaeaf, Equisetum hyemale
- Equisetum laevigatum
- Equisetum myriochaetum
- Marchrawnen ganghennog, Equisetum ramosissimum
- Equisetum scirpoides
- Marchrawnen fraith, Equisetum variegatum
Cysyltiadu â phobl
- Enw arall ar y llysywen yw llysywen rawn:
a freshwater eel often found in horse ponds. . . Believed to develop from horses tails. Notion that if 'rhawn' (horsetails) be pulled out by the root and put in the pond it will grow into eels. [3]
Cyfeiriadau
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