Hygrophila

Primary tabs

Hygrophila

Content

<<<<<Flowers>Ovary>Style>Stigma>Lobes>Shape

filiform1
1. 005-004-002-001-001-001

<<<<Flowers>Ovary>Style>Stigma>Lobes

stigmatic lobes2
2. 005-004-002-001-001

<<<Flowers>Calyx>Lobes>Shape

linear3
3. 005-001-002-001

<<<Flowers>Corolla>Lower lip>Lobe number

3-lobed4
4. 005-002-005-001

<<<Flowers>Corolla>Upper half>Shape

funnel-shaped5
5. 005-002-002-001

<<<Flowers>Corolla>Upper lip>Lobe number

2-lobed6
6. 005-002-004-002

<<<Flowers>Corolla>Upper lip>Teeth number

2-dentate7
7. 005-002-004-001

<<<Flowers>Ovary>Style>Stigma

, posterior stigma lobe abortive8
8. 005-004-002-001

<<<Flowers>Stamens>Anthers>Theca number

2-thecous9
9. 005-003-005-001

<<Capsules>Retinacula>Shape

short and obtuse10
10. 006-002-001

<<Capsules>Seeds>Hairs

covered with hygroscopic trichomes11
11. 006-003-003

<<Capsules>Seeds>Seed number

4-1812
12. 006-003-001

<<Capsules>Seeds>Shape

lenticular13
13. 006-003-002

<<Flowers>Calyx>Lobe number

5-lobed14
14. 005-001-001

<<Flowers>Calyx>Lobes

lobes subequal, , mature calyx tube often rupturing in weak hyaline regions between lobes;15
15. 005-001-002

<<Flowers>Corolla>Limbs

slightly curved limb ± personate16
16. 005-002-003

<<Flowers>Corolla>Lower lip

lower lip , corolla lobes contorted in bud;17
17. 005-002-005

<<Flowers>Corolla>Shape

cylindrical18
18. 005-002-001

<<Flowers>Corolla>Upper half

upper half19
19. 005-002-002

<<Flowers>Corolla>Upper lip

upper lip to ,20
20. 005-002-004

<<Flowers>Ovary>Ovule number per locule

several21
21. 005-004-001

<<Flowers>Ovary>Style

style ending in .22
22. 005-004-002

<<Flowers>Stamens>Anthers

anthers ,23
23. 005-003-005

<<Flowers>Stamens>Fertile stamen number

224
24. 005-003-002

<<Flowers>Stamens>Filaments

filaments of each pair usually basally connate by a membrane,25
25. 005-003-004

<<Flowers>Stamens>Stamen number

426
26. 005-003-001

<<Flowers>Stamens>Staminode number

227
27. 005-003-003

<<Flowers>Stamens>Thecae

thecae equal in length, parallel to sagittate, equally inserted, basally muticous or mucronulate;28
28. 005-003-006

<<Inflorescences>Bracts and bracteoles>Shape

linear29
29. 004-001-001

<<Leaves>Blade>Cystoliths

cystoliths present.30
30. 003-001-001

<Capsules>Retinacula

retinacula present, , septae with retinacula remaining attached to inner wall of mature capsule;31
31. 006-002

<Capsules>Seeds

seeds , , unequal at base, .32
32. 006-003

<Capsules>Shape

linear-ellipsoid33
33. 006-001

<Flowers>Calyx

calyx ,34
34. 005-001

<Flowers>Corolla

corolla tube , , ,35
35. 005-002

<Flowers>Ovary

ovary with ovules in each locule,36
36. 005-004

<Flowers>Stamens

stamens , didynamous, or fertile stamens and staminodes,37
37. 005-003

<Habit>Growth form

Diffuse to erect38
38. 001-001

<Inflorescences>Bracts and bracteoles

bracts and bracteoles , usually much shorter than calyx.39
39. 004-001

<Leaves>Blade

blades usually narrow,40
40. 003-001

<Stems>Shape

quadrangular41
41. 002-001

Capsules

Capsules estipitate, ,42
42. 006

Description

Diffuse to erect perennials, often aquatic or hygrophilous herbs. Stems quadrangular and articulated, decumbent and rooting at nodes. Leaves opposite, sessile to petiolate; blades usually narrow, cystoliths present. Inflorescences of dichasia in leaf axils, often appearing as verticels, dichasia of 1-many sessile or subsessile flowers; bracts and bracteoles linear, usually much shorter than calyx. Flowers weakly bilipped, homostylous; calyx 5-lobed, lobes subequal, linear, mature calyx tube often rupturing in weak hyaline regions between lobes; corolla tube cylindrical, upper half funnel-shaped, slightly curved limb ± personate, upper lip 2-dentate to 2-lobed, lower lip 3-lobed, corolla lobes contorted in bud; stamens 4, didynamous, or 2 fertile stamens and 2 staminodes, filaments of each pair usually basally connate by a membrane, anthers 2-thecous, thecae equal in length, parallel to sagittate, equally inserted, basally muticous or mucronulate; ovary with several ovules in each locule, style ending in filiform stigmatic lobes, posterior stigma lobe abortive. Capsules estipitate, linear-ellipsoid, retinacula present, short and obtuse, septae with retinacula remaining attached to inner wall of mature capsule; seeds 4-18, lenticular, unequal at base, covered with hygroscopic trichomes.

Distribution

Guianas present, Pantropical present
A pantropical genus of 20-30 species, represented in the Guianas by 4 species. Hygrophila sens. lat. includes numerous submerged aquatics, a number of which are found in the aquarium trade.

Flowers

Flowers weakly bilipped, homostylous;43
43. 005

Habit

perennials, often aquatic or hygrophilous herbs.44
44. 001

Inflorescences

Inflorescences of dichasia in leaf axils, often appearing as verticels, dichasia of 1-many sessile or subsessile flowers;45
45. 004

Leaves

Leaves opposite, sessile to petiolate;46
46. 003

Stems

Stems and articulated, decumbent and rooting at nodes.47
47. 002