Question: Which is a type of grass, Pleurothallis or Lamarckia?

Context paragraphs:
Poa napensis: Poa napensis is a rare species of grass known by the common name Napa bluegrass.  It is endemic to Napa County, California, where it is known from only two occurrences near Calistoga.  It grows in moist, mineral-rich soil around hot springs.  The rare grass only occurs on private, unprotected land and depends on water from the hot springs; changes to the local water regime or any other aspects of its specific habitat type would affect the plant.  This grass was federally listed as an endangered species in 1997, along with another rare local hot spring endemic, the Calistoga popcornflower ("Plagiobothrys strictus").

Echinochloa crus-galli: Echinochloa crus-galli is a type of wild grass originating from tropical Asia that was formerly classified as a type of panicum grass.  It is commonly known as cockspur (or cockspur grass), barnyard millet, Japanese millet, water grass, common barnyard grass, or simply "barnyard grass" (which may refer to any species of "Echinochloa" or the genus as a whole however).  This plant can grow to 60" (1.5 m) in height and has long, flat leaves which are often purplish at the base.  Most stems are upright, but some will spread out over the ground.  Stems are flattened at the base.  The seed heads are a distinctive feature, often purplish, with large millet-like seeds in crowded spikelets.

Foxtail (diaspore): A foxtail is a spikelet or cluster of a grass, that serves to disperse its seeds as a unit.  Thus, the foxtail is a type of diaspore or plant dispersal unit.  Some grasses that produce a foxtail are themselves called "foxtail", also "spear grass".  They can become a health hazard for dogs and other domestic animals, and a nuisance for people.  Foxtail Grass is most commonly found in the Great Plains where bison and other native animals graze on it.  Fires started by lightning can burn down Foxtail Grass, but the grass has roots underground that allow it to grow back.

Montina: Montina is a brand name of a type of flour created from milled Indian ricegrass ("Achnatherum hymenoides"), a type of grass native to the western United States.  Indian rice grass was grown and used by Native Americans as much as 7,000 years ago.  The grass is not related to rice, and the flour is gluten-free.

Poa diaboli: Poa diaboli is a rare species of grass known by the common name Diablo Canyon bluegrass.  It is endemic to San Luis Obispo County, California, where it is known from about five occurrences in the San Luis Mountains near the coast.  The type specimen was collected in Montaña de Oro State Park and the grass was described as a new species in 2003.  The grass occurs on rugged mountaintops and north-facing slopes in thin soils covering shale rock within a few kilometers of the coastline.  Its habitat includes chaparral, oak woodland, coastal sage scrub, and Bishop pine forest.

Lamarckia: Lamarckia is a Eurasian and African plant in the grass family.

Submission (Alton Towers): Submission was a Chance Rides Double Swinging Inverter located in the X-Sector area and was built in 2001.  From 2005, the ride only operated one of its arms to save electricity and the ride's cycles were shortened.  The slogan used in advertisement was 'Hang in there'.  Following the area's theme, the ride was painted blue and was covered in a shiny metal, most likely steel.  Each of its two arms had a counterweight in the shape of two metal spikes, which would sweep near to the ground like a scythe.  The sequence was always the same, different to some other weight based rides that have numerous sequences, this was also probably to be more energy efficient.  The Ride type itself is a rare flat-ride and not seen at a lot of themeparks, Submission did not have the best of reviews at Alton Towers mainly due to it having the same sequence (unlike others such as Ripsaw), the restraints were very similar to those on a Huss Top Spinner making it fairly uncomfortable to ride when inverted, breakdowns occasionally happened and as a result, queues were very short.  In 2013 it was later revealed that Submission would be closed after the end of the 2013 season by which there is a vacant grass area where it once stood next to the break-block section on Oblivion.  The grass area is often referred to as the 'Submission memorial ground' by thrill-seekers which has become a popular sitting area in the park section.

Pleurothallis: Pleurothallis, abbreviated Pths in horticultural trade, is a genus of orchids commonly named bonnet orchids.  The genus name is derived from the Greek word 'pleurothallos', meaning 'riblike branches'.  This refers to the rib-like stems of many species.

Dichelachne crinita: Dichelachne crinita , commonly known as the longhair plume grass, is a type of grass found in Australia, New Zealand and islands of the Pacific Ocean.  It is often seen on sandy soils near the sea as well as woodlands.  The flowering panicles are open and feathery at maturity.  The grass may grow up to 1.5 metres (5 ft) tall.  "Crinita", the specific epithet, is derived from Latin (hairy).

Flail mower: A flail mower is a type of powered garden/agricultural equipment, which is used to deal with heavier grass/scrub which a normal lawn mower could not cope with.  Some smaller models are self-powered, but many are PTO driven implements, which can attach to the three-point hitches found on the rear of most tractors.  This type of mower is best used to provide a rough cut to taller grass where contact with loose debris may be possible such as roadsides.

Supporting paragraphs: Pleurothallis Lamarckia
Answer: Lamarckia