Common Name: WATERWEED FAMILY Habit: Annual, perennial herb, aquatic, freshwater or marine, glabrous or hairy; monoecious, dioecious, or flowers bisexual. Leaf: basal, alternate, opposite, or whorled, generally sessile, generally +- sheathing at base. Inflorescence: axillary, terminal, or scapose, cyme or flowers 1, subtended by +- sheathing, entire or lobed bract; staminate flowers sometimes deciduous, free-floating. Flower: generally radial; perianth 0 or tube 0 or elongate, peduncle-like in flower; sepals (0)3(4), green; petals (0)3(4), white or not; stamens (0)2--many, generally in 1+ series; ovary inferior, chamber 1 or falsely 6--9, placentas parietal, ovules 1--many, style lobes generally 3, linear, lobed or notched. Fruit: achene or berry-like and dehiscing irregularly, linear to spheric, submersed. Genera In Family: +- 17 genera, +- 130 species: worldwide; some cultivated for aquaria, others noxious weeds. Note:Ottelia alismoides (L.) Pers. is a possibly extirpated alien. eFlora Treatment Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes Scientific Editor: Thomas J. Rosatti.
Habit: Annual, aquatic, submersed, mat-like or not; monoecious or dioecious. Stem: several, often much-branched, slender. Leaf: simple, cauline, +- opposite to +- whorled, sessile; sheath generally wider than, expanded abruptly at junction with blade; blade generally linear, margin entire to coarsely spine-toothed. Inflorescence: axillary; flowers 1--few, clustered, inconspicuous. Staminate Flower: subtended by (0)2 minute involucres, inner membranous, flask-shaped, outer cup-like, tubular, or with free scales; perianth 0; stamen 1, anther opening irregularly, subsessile. Pistillate Flower: generally not subtended by involucres; perianth 0; ovary 1, chamber 1, ovule 1, style short, generally terminal (from center of ovary, fruit top), stigma 2--4-lobed. Fruit: achene-like, fusiform; outer wall thin, +- translucent. Etymology: (Greek: water nymph) Note:Najas graminea Delile is an agricultural weed. Reference: Haynes 2000 FNANM 22:77--83 Unabridged Reference: Shaffer-Fehre 1991 Bot J Linn Soc 107:189--209; Haynes 2000 FNANM 22:77--83
Najas flexilis (Willd.) Rostk. & W.L.E. Schmidt
NATIVE Habit: Monoecious. Stem: internodes not prickled. Leaf: margin teeth 35--80 per side, tip acute, with 1--2 teeth; sheath tip rounded. Staminate Flower: 1--3 mm; anther chambers 1. Pistillate Flower: 2.5--4.7 mm; stigma 3-lobed. Seed: 0.2--1.2 mm wide, narrowly to widely obovate, coat smooth, shiny. Chromosomes: 2n=12,24. Ecology: Uncommon. Ponds, lakes; Elevation: < 1500 m. Bioregional Distribution: KR, NCoRI, expected elsewhere; Distribution Outside California: to Canada, northeastern United States; northern Europe. Flowering Time: Jun--Sep Jepson eFlora Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes Reference: Haynes 2000 FNANM 22:77--83 Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Previous taxon: Najas Next taxon: Najas gracillima
Citation for this treatment: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes 2012, Najas flexilis, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=34350, accessed on April 22, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on April 22, 2024.
No expert verified images found for Najas flexilis.
Geographic subdivisions for Najas flexilis:
KR, NCoRI, expected elsewhere
MAP CONTROLS 1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
Data provided by the participants of the
Consortium of California Herbaria.
MAP LEGEND View all CCH records All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS
CCH collections by month
Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).