In computer science, a queue ( ) is a particular kind of abstract data type or collection in which the entities in the collection are kept in order and the principle (or only) operations on the collection are the addition of entities to the rear terminal position, known as "enqueue," and removal of entities from the front terminal position, known as "dequeue".
 This makes the queue a First-In-First-Out (FIFO) data structure.
 In a FIFO data structure, the first element added to the queue will be the first one to be removed.
 This is equivalent to the requirement that once a new element is added, all elements that were added before have to be removed before the new element can be removed.
 Often a "peek" or "front" operation is also entered, returning the value of the front element without dequeuing it.
 A queue is an example of a linear data structure, or more abstractly a sequential collection.
Sparganium americanum, American bur-reed, is a perennial plant found in the United States of America and Canada.
 Though this species resembles a grass, it is a type of bur-reed.
 This species is important for conservation purposes because it has the ability to remove nitrogen and phosphorus runoff from water, like many other wetland species.
 By doing this it protects waterways from excess nitrogen which can cause eutrophication.
 This increased nitrogen is especially a problem during the farmers’ growing season.
 During this same time frame the "S. americanum" is growing and taking up nitrogen.
Corporate taxonomy is the hierarchical classification of entities of interest of an enterprise, organization or administration, used to classify documents, digital assets and other information.
 Taxonomies can cover virtually any type of physical or conceptual entities (products, processes, knowledge fields, human groups, etc.) at any level of granularity.
In computing, an object-oriented user interface (OOUI) is a type of user interface based on an object-oriented programming metaphor.
 In an OOUI, the user interacts explicitly with objects that represent entities in the domain that the application is concerned with.
 Many vector drawing applications, for example, have an OOUI – the objects being lines, circles and canvases.
 The user may explicitly select an object, alter its properties (such as size or colour), or invoke other actions upon it (such as to move, copy, or re-align it).
 If a business application has any OOUI, the user may be selecting and/or invoking actions on objects representing entities in the business domain such as customers, products or orders.
Sparganium natans is a species of bur-reed known by the common names least bur-reed and small bur-reed.
 It is a water plant native to high elevation lakes and marshes of Canada and the northern United States.
 It is usually found submersed in shallow, calm water.
 This bur-reed has thin, flexible, grasslike leaves which float in the water.
 Plants that spend more time out of water at the waterline are tougher and have shorter leaves.
 The plant bears two inflorescences, the staminate type being a rounded white filamentous ball and the pistillate type a sphere of thick, green, pointy peduncles.
 The fruits are small green or brown achenes.
Agrostology (from Greek ἄγρωστις , "agrōstis", "type of grass"; and -λογία , "-logia"), sometimes graminology, is the scientific study of the grasses (the family Poaceae, or Gramineae).
 The grasslike species of the sedge family (Cyperaceae), the rush family (Juncaceae), and the bulrush or cattail family (Typhaceae) are often included with the true grasses in the category of graminoid, although strictly speaking these are not included within the study of agrostology.
 In contrast to the word graminoid, the words gramineous and graminaceous are normally used to mean "of, or relating to, the true grasses (Poaceae)".
The Cyperaceae are a family of monocotyledonous graminoid flowering plants known as sedges, which superficially resemble grasses and rushes.
 The family is large, with some 5,500 known species described in about 90 genera, the largest being the "Carex" genus of "true sedges" with over 2,000 species.
 These species are widely distributed, with the centers of diversity for the group occurring in tropical Asia and tropical South America.
 While sedges may be found growing in almost all environments, many are associated with wetlands, or with poor soils.
 Ecological communities dominated by sedges are known as sedgelands.
In the Standard Generalized Markup Language (SGML), an entity is a primitive data type, which associates a string with either a unique alias (such as a user-specified name) or an SGML reserved word (such as codice_1).
 Entities are foundational to the organizational structure and definition of SGML documents.
 The SGML specification defines numerous entity types, which are distinguished by keyword qualifiers and context.
 An entity string value may variously consist of plain text, SGML tags, and/or references to previously-defined entities.
 Certain entity types may also invoke external documents.
 Entities are called by reference.
Waikavirus is a genus of viruses in the order Picornavirales, in the family Secoviridae.
 Plants, poaceae, cyperaceae, and gramineae serve as natural hosts.
 There are currently three species in this genus including the type species Rice tungro spherical virus.
 Diseases associated with this genus include: MCDV: plant stunting and chlorotic striping of tertiary leaf veins in maize.
Sparganium (bur-reed) is a genus of flowering plants, described as a genus by Linnaeus in 1753.
 It is widespread in wet areas in temperate regions of both the Northern and Southern Hemispheres.
 The plants are perennial marsh plants that can grow to 3.5 m (depending on the species), with epicene flowers.

Question: Sparganium and Cyperaceae, are which type of entities?
Answer: flowering plants