---
title: Rhubarb stalks are safe to eat cooked, but rhubarb leaves are poison… — Plants deeper: poisonous and stinging plants and… · tree and pragmatics
description: Rhubarb stalks are safe to eat cooked, but rhubarb leaves are poisonous because they contain a lot of oxalic acid. Who acts: Rhubarb stalks, rhubarb leaves, leaves. A sentence of the lesson «Plants deeper: poisonous and stinging plants and staying safe» of the biology course of Mova's primary school
---

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# Plants deeper: poisonous and stinging plants and staying safe, sentence 14

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Rhubarb stalks are safe to eat cooked, but rhubarb leaves are poisonous because they contain a lot of oxalic acid.

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**Who acts:** Rhubarb stalks, rhubarb leaves, leaves · **What happens:** be, eat, cook, contain · **To what, where:** lot

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This is a sentence of the lesson «Plants deeper: poisonous and stinging plants and staying safe» of the biology course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (Rhubarb stalks, rhubarb leaves, leaves), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:255-plants-deeper-poisonous-and-stinging-plants-and-staying-safe.lesson:14
# text = Rhubarb stalks are safe to eat cooked, but rhubarb leaves are poisonous because they contain a lot of oxalic acid.
# source = school lesson (ours)
# course = biology
# lesson = 255-plants-deeper-poisonous-and-stinging-plants-and-staying-safe.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change
1	Rhubarb	rhubarb	NOUN	NN	Number=Sing	2	compound	_	_
2	stalks	stalk	NOUN	NNS	Number=Plur	4	nsubj	_	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
4	safe	safe	ADJ	JJ	Degree=Pos	0	root	_	_
5	to	to	PART	TO	_	6	mark	_	_
6	eat	eat	VERB	VB	VerbForm=Inf	4	xcomp	_	_
7	cooked	cook	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	6	xcomp	_	_
8	,	,	PUNCT	,	_	13	punct	_	_
9	but	but	CCONJ	CC	_	13	cc	_	_
10	rhubarb	rhubarb	NOUN	NN	Number=Sing	11	compound	_	_
11	leaves	leaf	NOUN	NNS	Number=Plur	13	nsubj	_	_
12	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	13	cop	_	_
13	poisonous	poisonous	ADJ	JJ	Degree=Pos	4	conj	_	_
14	because	because	SCONJ	IN	_	16	mark	_	_
15	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	16	nsubj	_	_
16	contain	contain	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	13	advcl	_	_
17	a	a	DET	DT	Definite=Ind|PronType=Art	18	det	_	_
18	lot	lot	NOUN	NN	Number=Sing	16	obj	_	_
19	of	of	ADP	IN	_	21	case	_	_
20	oxalic	oxalic	ADJ	JJ	Degree=Pos	21	amod	_	_
21	acid	acid	NOUN	NN	Number=Sing	18	nmod	_	_
22	.	.	PUNCT	.	_	4	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | Rhubarb stalks |  |  |  |  | safe *property* | tree rules |
| 2 | **eat** | to-infinitive | Rhubarb stalks *not said here* |  |  |  |  |  | tree rules |
| 3 | **cook** | participle | Rhubarb stalks *not said here* |  |  |  |  |  | vn cooking-45.3 «NP.patient V»: agent=Patient |
| 4 | **is** | present | rhubarb leaves |  |  |  |  | poisonous *property* | tree rules |
| 5 | **contain** | present | leaves *= leaf* | a lot of oxalic acid |  |  |  |  | vn comprise-107.2-2 «NP V NP»: agent=Pivot lot=Theme |

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One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:biology:255-plants-deeper-poisonous-and-stinging-plants-and-staying-safe.lesson:14`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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- ← previous: [Plants deeper: poisonous and stinging…, 13](https://md.mova.elamur.ai/free/en/corpora/school/biology/255-plants-deeper-poisonous-and-stinging-plants-and-staying-safe/13/)
- next →: [Plants deeper: poisonous and stinging…, 15](https://md.mova.elamur.ai/free/en/corpora/school/biology/255-plants-deeper-poisonous-and-stinging-plants-and-staying-safe/15/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/biology/255-plants-deeper-poisonous-and-stinging-plants-and-staying-safe/)