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Published In: Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 66: 92. 1933. (Bot. Jahrb. Syst.) Name publication detail
 

Project Name Data (Last Modified On 7/20/2009)
 

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DICTYOPHRAGMUS O. E. Schulz, Bot. Jahrb. Syst. 66: 92. 1933.

Ihsan A. Al-Shehbaz

Tribe:

Name derivation: from Greek dictyos, net or reticulum, and phragmos, fence or partition, in reference to the reticulately veined septem of the fruit.

Type species: D. englerianus (Muschler) O. E. Schulz (based on Streptanthus englerianus Muschler).

     Herbs, annual. Trichomes absent. Multicellular glands absent. Stems erect to ascending, simple or branched basally and/or apically. Basal leaves soon withered; cauline leaves sessile, auriculate to amplexicaul at base, dentate, repand, or rarely entire.  Racemes ebracteate or bracteate throughout, corymbose, elongated in fruit; rachis straight or flexuous; fruiting pedicels slender, divaricate, straight or slightly curved, persistent. Sepals oblong, free, deciduous, erect, equal, base of inner pair not saccate. Petals white, erect at base with flaring blade, longer than sepals; blade obovate or spatulate, apex obtuse; claw shorter than sepals, glabrous or papillate, unappendaged, entire. Stamens 6, slightly exserted, erect, tetradynamous; filaments wingless, unappendaged, glabrous or papillose at base, free; anthers oblong, not apiculate at apex. Nectar glands confluent and subtending bases of all stamens; median nectaries present. Ovules 8-50 per ovary; placentation parietal. Fruit dehiscent, capsular siliques, linear to linear-lanceolate, strongly latiseptate, not inflated, unsegmented; valves papery, with a prominent midvein or obscurely veined, not keeled, torulose, wingless, unappendaged; gynophore absent; replum rounded, visible; septum complete, veinless or prominently veined; style obsolete or distinct and to ca. 2 mm long, cylindric, persistent; stigma capitate, entire, unappendaged. Seeds uniseriate, broadly winged all around or wingless, suborbicular or broadly ovate or oblong, strongly flattened; seed coat reticulate, not mucilaginous when wetted; cotyledons accumbent.

Three species: Argentina and Peru.

References: Al-Shehbaz (1991c, 2006e).

 

 

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1. Raceme bracteate; fruit (3-)3.5-7 cm long; valves with a prominent midvein; septum

     veinless; ovules/seeds 24-50 per ovary/fruit; filaments and claws glabrous ...............  3. D. punensis

1. Raceme ebracteate; fruit 1.5-3(-3.6) cm long; valves with an inconspicuous midvein;

     septum prominently veined; ovules/seeds 6-16 per ovary/fruit; filaments and claws papillate.

     2. Seeds broadly winged all around, suborbicular to broadly ovate, 2.5-3 mm diam.; fruit 3-4

          mm wide......................................................................................................... 1. D. englerianus

     2. Seeds wingless, oblong, 1.8-2 mm long; fruit 1.5-2 mm wide.......................... 2. D. lactucoides

 

 
 
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