Linum Linnaeus 1753
Creators: name: González-Velasco, Juan
name: Burgos-Hernández, Mireya
name: Galván-Escobedo, Iris G.
name: Castillo-Campos, Gonzalo
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Malpighiales
Linaceae
Linum

description: Key to Linum species in Mexico
1. Fruit dehiscent into 5 segments ..........................................................................................................................................................2
- Fruit dehiscent into 10 segments ........................................................................................................................................................8
2. Corolla yellow ....................................................................................................................................................................................3
- Corolla yellow-orange to salmon with a red to wine-red base...........................................................................................................5
3. Root thin; stem puberulent at the base; fruit ovoid ............................................................................................................................4
-. Root thick; stem glabrous; fruit ellipsoid ........................................................................................................................ L. aristatum
4. Stipular glands absent, sometimes present only in some parts, then barely conspicuous.................................................. L. australe
- Stipular glands present throughout the plant, very conspicuous .......................................................... L. australe var. glandulosum
5. Stems pilose locally or throughout .....................................................................................................................................................6
-. Stems glabrous throughout .................................................................................................................................................................7
6. Plant hirsutulose at the base; sepals glabrous; fruit with translucent thin pericarp............................... L. berlandieri var. filifolium
- Plant densely gray-puberulent to the inflorescence; sepals pubescent; fruit with thick opaque pericarp ..................... L. puberulum
7. Basal leaves alternate; sepals deciduous, 3-nerved; anthers brick-red........................................................................... L. elongatum
-. Basal leaves opposite; sepals persistent, 1-nerved; anthers brown ..................................................................................... L. vernale
8. Corolla blue ........................................................................................................................................................................................9
- Corolla yellow, yellow-orange, white, or pink .................................................................................................................................11
9. Stems erect or ascending ..................................................................................................................................................................10
- Stems creeping or prostrate ............................................................................................................................................ L. rzedowskii
10. Pedicels villous; anthers white; stigmata capitate ................................................................................................................. L. lewisii
- Pedicels glabrous; anthers bright-yellow; stigmata linear to claviform ................................................................... L. usitatissimum
11. Plants densely pubescent throughout................................................................................................................................................12
- Plants glabrous or locally pubescent ................................................................................................................................................13
12. Basal leaves opposite; bracts with stipular glands, conspicuous; petals yellow-orange, pilose at the base.................. L. scabrellum
- Basal leaves in whorls; upper bracts without stipular glands; petals yellow, glabrous..................................................... L. tenellum
13. Stems decumbent..............................................................................................................................................................................14
- Stems erect........................................................................................................................................................................................15
14. Leaves widely ovate or elliptical, scariose; anthers 0.7–1.2 mm long............................................................................... L. cruciata
- Leaves narrowly oblanceolate, obovate to narrowly elliptical, rough; anthers 0.5 mm long...................................... L. lasiocarpum
15. Annual herbs.....................................................................................................................................................................................16
- Perennial herbs .................................................................................................................................................................................17
16. Basal leaves in whorls, obovate; 3-nerved sepals; styles fused to near the apex; fruit pale-yellow throughout............... L. longipes
- Basal leaves opposite, elliptical-oblanceolate; 1-nerved sepals; styles free; fruit yellow with purple hues on the upper portion ...... ................................................................................................................................................................................ L. neomexicanum
17. Root thick .........................................................................................................................................................................................18
- Root thin ...........................................................................................................................................................................................20
18. Basal leaves opposite or in whorls; stigmata light brown; fruit yellow with purple hues at the upper portion ...............................19
- Basal leaves alternate; stigmata yellow; fruit yellow throughout ................................................................................... L. flagellare
19. Styles free or connate at the base ...................................................................................................................................... L. orizabae
- Styles fused to half or close to the apex ....................................................................................................................... L. mexicanum
20. Fruit glabrous....................................................................................................................................................................................21
- Fruit pubescent at the apex ................................................................................................................................................. L. nelsonii
21. Fruit yellow with purple hues at the upper portion; petals white or pink........................................................................... L. pringlei
- Fruit yellow throughout; petals yellow to greenish-yellow..............................................................................................................22
22. Basal leaves alternate or opposite....................................................................................................................................... L. rupestre
- Basal leaves in whorls ......................................................................................................................................................................23
23. Leaves with stipular glands at the base; pedicels 0.1–0.2 mm long; bracts 2.0–3.0 mm long; sepals 2.0–5.0 × 1.0– 1.5 mm, seeds reddish-brown............................................................................................................................................................ L. schiedeanum
- Leaves without stipular glands at the base; pedicels 3.5–14.7 mm long; bracts 0.6–1.1 mm long; sepals (1.2)1.7–1.8 × 0.5–0.7 mm; seeds light brown.................................................................................................................................................... L. modestum
description: Published as part of González-Velasco, Juan, Burgos-Hernández, Mireya, Galván-Escobedo, Iris G. & Castillo-Campos, Gonzalo, 2022, Taxonomic update of the flax family in Mexico, pp. 141-184 in Phytotaxa 549 (2) on pages 146-147, DOI: 10.11646/phytotaxa.549.2.3, http://zenodo.org/record/6622753